Don't use physical orientation to compute area for screenshot

When computing the rotation for the screenshot, don't include the
physical display orientation since it causes the incorrect orientation
for screenshots

Test: Set a physical display orientation and rotate display. This takes
the screenshot with identity = true
Bug: 157164835
Bug: 170056945

Change-Id: Ic938c5ecf09f5389fb0d0f96417ee9f39769a2c4