SnapdragonCamera:  ROI circle becomes oval when start/stop recording

Face circle is drawed by Canvas.drawOval. When start/stop recording,
face Rect is stretched to rectangle and lead to ROI circle become oval.
So, change Canvas.drawOval to Canvas.drawCircle

CRs-Fixed: 1099754
Change-Id: If6258d844c0685a65439c3fe536674a4f6260b48
1 file changed