fix unescaped dollar symbols

[idleberg]

As reported in the Visual Studio Code console:

t.$localShowMessage @ /Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:28
/Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:28 [~/.vscode/extensions/liuji-jim.vue-0.1.5]: The "add"-snippet very likely confuses snippet-variables and snippet-placeholders. See https://code.visualstudio.com/docs/editor/userdefinedsnippets#_snippet-syntax for more details.
t.$localShowMessage @ /Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:28
/Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:28 [~/.vscode/extensions/liuji-jim.vue-0.1.5]: The "delete"-snippet very likely confuses snippet-variables and snippet-placeholders. See https://code.visualstudio.com/docs/editor/userdefinedsnippets#_snippet-syntax for more details.
t.$localShowMessage @ /Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:28
/Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:28 [~/.vscode/extensions/liuji-jim.vue-0.1.5]: The "eval"-snippet very likely confuses snippet-variables and snippet-placeholders. See https://code.visualstudio.com/docs/editor/userdefinedsnippets#_snippet-syntax for more details.
t.$localShowMessage @ /Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:28
/Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:28 [~/.vscode/extensions/liuji-jim.vue-0.1.5]: The "set"-snippet very likely confuses snippet-variables and snippet-placeholders. See https://code.visualstudio.com/docs/editor/userdefinedsnippets#_snippet-syntax for more details.
t.$localShowMessage @ /Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:28
/Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:28 [~/.vscode/extensions/liuji-jim.vue-0.1.5]: The "get"-snippet very likely confuses snippet-variables and snippet-placeholders. See https://code.visualstudio.com/docs/editor/userdefinedsnippets#_snippet-syntax for more details.
t.$localShowMessage @ /Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:28
/Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:28 [~/.vscode/extensions/liuji-jim.vue-0.1.5]: The "ipo"-snippet very likely confuses snippet-variables and snippet-placeholders. See https://code.visualstudio.com/docs/editor/userdefinedsnippets#_snippet-syntax for more details.
t.$localShowMessage @ /Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:28
/Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:28 [~/.vscode/extensions/liuji-jim.vue-0.1.5]: The "log"-snippet very likely confuses snippet-variables and snippet-placeholders. See https://code.visualstudio.com/docs/editor/userdefinedsnippets#_snippet-syntax for more details.
t.$localShowMessage @ /Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:28
/Applications/Visual Studio Code.app/Contents/Resources/app/out/vs/workbench/electron-browser/workbench.main.js:28 [~/.vscode/extensions/liuji-jim.vue-0.1.5]: The "wat"-snippet very likely confuses snippet-variables and snippet-placeholders. See https://code.visualstudio.com/docs/editor/userdefinedsnippets#_snippet-syntax for more details.