Also fixed paddings a bit (e.g. Done button was too close to the icon grid).
Fixes: 369503296
Test: manual
Flag: android.app.modes_ui
Change-Id: Ic7b7dc9584db1f04b448fce828a8ec70cf17f06a
Ensure that horizontal spacing between items in the icon picker is distributed to the left and right of the row instead of between the items. This makes the horizontal and vertical spacing the same.
Bug: 359171199
Test: manual + hsv
Flag: android.app.modes_ui
Change-Id: I68c3860ba4092bb6fde2a1218b3f6a95d0c373da