Cleaned up the if then statements

[fivestones]

Set all the if-then statements to use the bash [[ (test command) by surrounding them with [[ and ]] Removed all the -eq, replaced with ==

Fixes https://github.com/selfire1/BibleGateway-to-Obsidian/issues/23 and https://github.com/selfire1/BibleGateway-to-Obsidian/issues/21.