Fix a bug that captured image in review is rotated

Fix a bug that captured image in review is rotated

If the default camera app is triggered by intent and the app
orientation is different from the screen orientation, the
captured image in review will be rotated.

This is because calling setScale() clears the whole matrix and make the
previous preRotate() call meaningless. Changing to postScale() solves
the problem.

BUG=31939529
TEST=Verify that the captured image in review is not rotated

Change-Id: I6d93bac094ba9b6381e350d4007e3c65c1425e31
(cherry picked from commit 3399d3acca6a65a28784185e8164e0bb40d4ef45)