SnapdragonCamera: fix the incorrect aspect ratio calculation

For square size picture, the function that calculates the closest
aspect ratio, forced it to use 4:3 ratio and caused the preview
stretched from 1:1 to 4:3.
Fix the issue by skipping the logic that forces it to
4:3 aspect ratio when the picture size is square.

Change-Id: Ia7d8250152ce37f4444f7db7c752eeb8489d9a2f
CRs-Fixed: 955824
1 file changed