Removing flag com.android.launcher3.enable_grid_only_overview from trunk_staging.

This change was automatically created by rolling back a Gantry workflow.

Bug: 257950105
Change-Id: I04de7d160c4ec0680384cfb67ee62519b7fb4b23
Flag: com.android.launcher3.enable_grid_only_overview
Ignore-AOSP-First: AConfig change for future AOSP release
1 file changed