Revert "Have consistent All Apps UI between grid size changes."

Revert submission 557031-1571265377317-631e3e5

Reason for revert: Breaks multiwindow and secondary display layout
Reverted Changes:
Idee087e31:Remove numAllAppsColumns, allAppsIconSize, allApps...
I6235862c9:Have consistent All Apps UI between grid size chan...

Change-Id: I64156123a8fbaba1a7d2b64cddd5376671123aa2