[Flag cleanup] com.android.systemui.floating_menu_animated_tuck

Bug: 297556899
Bug: 341094178
Test: atest MenuAnimationControllerTest
Test: manual
    - Disable the flag and see no affects the FAB
    - Drag the FAB to the edge, then drag to dismiss the FAB. Make sure
      there is no view being cutoff.
Flag: N/A
Change-Id: Ibd36d05c4eceea193eb84fe3437cdf046be61f3a