Update Gallery2 camera launchers

This updates the Camera launcher icons used in the trampoline activity
which preserves existing shortcuts from Camera icons on JB MR2 home screens.

Bug: 11242234
Change-Id: I1fa83f4353112130b2f35d8d6a6884f090e3da82
updated camera launcher icon in Gallery2 package as well

fixes b/11252316

Change-Id: I164492e9fd6544257d685279c35ba026f24ca79d