AppLauncher: show app names by default

No not *that* Application launcher, the other one...

By now we pretty much show app names by default everywhere, rather than
their GenericName or Description values. This hidden off-by-default
click-on-the-desktop app launcher menu is one of the last places where
you'll see those. So let's make it consistent with the world around it.

CCBUG: 473373