Fix NPE in letterbox double tap
We check the Letterbox surrfaces are in a valid state before invoking the double tap callback. We also put the callback invocation under the WindowManagerService GlobalLock. Fixes: 294185001 Test: Run `atest WmTests:LetterboxTest` Change-Id: I076e0b62b3567145f1185e29a29411f53bdf5b90
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