Bug 919834 - Hide advanced menu in media storage settings if there is on...

...ly one or no storage area

Also hide the button to media storage settings in Camera, Gallery, Music, and Video apps and change wording in these apps in case of one or no storage area on the phone.

[https://bugzilla.mozilla.org/show_bug.cgi?id=919834](https://bugzilla.mozilla.org/show_bug.cgi?id=919834)