[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

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: Ia9fcea247278adbec7cd8478c6c8f5c118d7ce68