[2/n] Only DesktopModeLaunchParamsModifier resolve freeform launch

Only allow DesktopModeLaunchParamsModifier to resolve freeform bounds if
the task is launching in freeform and in freeform display (desktop).

With multiple desks, freeform tasks are children of a root task
controlled by DesksOrganizer, so don't skip resolving freeform bounds if
launching freeform tasks with multiple desks enabled.

Flag: com.android.window.flags.enable_freeform_display_launch_params
      com.android.window.flags.enable_multiple_desktops_backend
Bug: 401564801
Test: atest DesktopModeLaunchParamsModifierTests
Change-Id: If1f1784dc8dfcdc5eee9aa4d35a23a340310052c