Launcher2: Fixes
- fix build
- fix dialog for setting homescreens
- restart launcher on default homescreen change
- clean up a small block of whitespace (there's likely more, but it can be fixed once this is working right)
Signed-off-by: Luis Cruz <ljc2491@gmail.com>

Change-Id: I7feb8c38d8fb136f6f464ebd87b562c8ef1fbb85