Add Line to Desktop files of AppImages to Show Waiting Cursor While They Open

[amethystgosling163]

That line is
StartupNotify=True

Needs to be added to every AppImage that is installed in Gear Lever.

It'll help in creating the illusion that they are actual applications that are launching, not ones that were integrated by a third-party program (by making the system behave in the same way that it does when opening other applications).