launcher: use same icon size for all apps drawer in foldables

For foldables, no matter the grid size, we use 60dp for icons sizes.
This also fix a bug where the icon size was always the minimum between
default and all apps, which means that for foldables it would always be
default.

Bug: 202708085
Test: visual, using HSV and Window
Change-Id: I315718a8ba7a0aaed2204ad12e6b184dda2be48e