Do not use seamless rotation for multi-window

Otherwise other non seamless apps may be flickering. Also it
potential causes sync problem when split-screen uses sync
group and seamless rotation uses applyWithNextDraw at the
same time.

Note that shell transition doesn't have the problem in split
screen because it will reject seamless if there is one changed
task doesn't declare seamless. So at least the split root task
will guard the case.

Bug: 236926512
Test: Enter split-screen with an app using ROTATION_ANIMATION_SEAMLESS.
      Rotate the display and there will be a normal rotation animation.
Change-Id: I6a44c1d3530cb92bdf6ebd81f1a520158b552d00