keymap: Move 'project_panel::NewSearchInDirectory' to a dedicated bind

[notpeter]

Previously cmd-shift-f / ctrl-shift-f had different behavior when invoked from the project panel context than from an editor (for project panel include field was populated from the currently select project panel directory).

Change this so that it has it's own keybind of cmd-alt-shift-f / ctrl-alt-shift-f so cmd-shift-f and ctrl-shift-f has consistent behavior (pane::DeploySearch) everywhere.

Release Notes:

• Add dedicated keybind for "Find in Folder..." from the project panel (cmd-alt-shift-f, ctrl-alt-shift-f).