Do not transfer pending snapshot starting data to different orientation

Otherwise the snapshot will be squeezed to the unmatched size, and the
content shows in a different orientation.

Bug: 379593519
Flag: EXEMPT bugfix
Test: Launch an opaque portrait activity X.
      Launch a translucent landscape activity Y with
        android:resumeWhilePausing="true" (easier to transfer)
        on the same task of X.
      Return to home and launch X's task.
      Y calls finish() in its onResume.
      The landscape starting window should not reparent to X.
Change-Id: I8bff6f358cfdb3208f3ffa9eca5eceabaa0e6475