Fixing the weird preview size w/ effects on camera

The aspect ratio sent from the camera app to the SurfaceTextureTarget
filter  does not really matter now since the camera app handles
the re-sizing. Hence, the SurfaceTextureTarget filter needs to be render
in "stretch" mode all the time even though the aspect ratio sent to the
filter might indicate otherwise. The filter still needs the correct
frame size for things other than determining aspect ratio.

Fix b/6430124

Change-Id: Ie7fa5cd2adf2a8d41e6e005418f6c6fd738ed85d