Code review comment for lp:~gala-dev/gala/no-animate-depth

This is better, but Slingshot still appears with a visual BOOM!

Also, I'm not sure why a GSettings key for this should be introduced. First, the name of the key is confusing, since it affects only some of the animations. Seconf, if these animations have superior usability, we should probably hardcode them - as per http://elementaryos.org/docs/avoid-configuration