Inherit source windowing mode in some cases.

We allow freeform windows on fullscreen displays launch activities in
freeform windows if they'll be on the same display.

Bug: 139274544
Test: FreeformWindowingModeTests#testFreeformWindowManagementSupport
passed on fullscreen display.
Test: atest WmTests:TaskLaunchParamsModifierTests

Change-Id: Ib1b75145c0b0b38b07bcde2ca66a1d772a2c2d0f