Bug 976481: don't display "Media Storage Settings" buttons in media apps when there is no sdard.

remove media settings button from Camera overlay

remove media settings button from Gallery overlay

remove media settings button from Video app overlay

remove media settings button from the Music app overlay
Merge pull request #16722 from davidflanagan/bug976481-v1.3

Bug 976481: don't display "Media Storage Settings" buttons in media apps... r=pdahiya a=1.3+