Camera2: Invoke saveVideo when mVideoFileDescriptor != null

If MediaStore.EXTRA_OUTPUT is not specified, the video
file still needs to be saved to default external storage.

Test: Run BYOD Managed Provisioning video capture without
      extra output path
Bug: 215294773
Change-Id: I586642681ef257fee808cc17bf879c86ef346e76
Signed-off-by: linghao.kong <[email protected]>
1 file changed