Print document generation: Schedule new layout if current command is canceling

In this case the mUpdateSpec will be marked as stale once the command
is done, hence we have to start from scratch.

Fixes: 117124112
Test: - Reproduced scenario in bug
      - atest CtsPrintTestCases

Change-Id: I98e11d28147bae638d68b2124507d04f825a392f
1 file changed