Camera: Enable module switcher on resume

For HDR mode, on pressing shutter key, module switcher icon will be
turned off. That'll not be activated if user relaunch camera
after pressing home key in HDR mode while capturing image.

Enable switcher in UI on resuming camera module.

Change-Id: I094f4941f87149e4c5b2393881ed5175c4388559
CRs-fixed: 580450