Make building the script not depend on PathFinder being installed at compile-time

When PathFinder is not installed at compile-time, the command `osacompile -o Support.scpt Support.applescript` returns an error because `osascript` seems to look for the app at compile-time.

This commit makes compiling the script independent from PathFinder being installed.

**Note:** Before merging, could someone who has PathFinder installed please double-check that the script still works, i.&nbsp;e. the folder still pops up in PathFinder?
Thanks a lot in advance!