Maintain aspect ratio in DragPositioningCallbackUtility.changeBounds()

Adjusting one side of an unresizeable app without also adjusted a
adjacent edge in proportion will cause the aspect ratio of the bounds to
change. To prevent the aspect ratio of unresizeable apps being modified,
opt to reset all coordinates to their previous valid state if at least
one of the coordinates needs adjusting due to constraints.

Flag: com.android.window.flags.enable_windowing_scaled_resizing
Fix: 366424454
Test: atest WMShellUnitTests:DragPositioningCallbackUtilityTest
Test: atest WMShellUnitTests:VeiledResizeTaskPositionerTest
Test: atest WMShellUnitTests:FluidResizeTaskPositionerTest
Change-Id: I4959f3a9a725e619bb620f00cc383e939a173e79