HDR: only show slide animation after final shot

Also make sure to reset mBurstShotsDone to 0 after taking the
final shot for the HDR image.

Change-Id: I5cb4d5286402b577e097d57aa4cc9d850a317aef
Merge branch 'cm-10.1' of git://github.com/CyanogenMod/android_packages_apps_Camera into jb-mv