[2/n] Let picker refresh preview when user selects a different grid

When user taps on a different grid, ask to refresh preview instead of asking launcher to change grid size

Resbumit of ag/24344634 which was reverted due to automerger failing to merge into main.

Test: disable FLAG_NAME_GRID_APPLY_BUTTON and change grid size still works, enable the flag and change grid size has not effect
Bug: 294866224
Change-Id: Id8e808f119f15e0e2431d6fab2a050d75cd4a1a4