Put EnableMouseInteractionChanges behind desktop form factor value

Ensure that the EnableMouseInteractionChanges feature only affects
desktop devices, by adding a check for the desktop_form_factor value.

Flag: com.android.launcher3.enable_mouse_interaction_changes
Bug: 388897603
Test: Manual
Change-Id: I483def8ca249a83e5d028e71db74ec85a700bfb4
3 files changed