Added fullBackupContent attribute to manifest.
Added fullBackupContent attribute to manifest.

flipreverse/syncthing-android,jmintb/syncthing-android,lkwg82/syncthing-android,Zillode/syncthing-android,Zillode/syncthing-android,syncthing/syncthing-android,flipreverse/syncthing-android,wweich/syncthing-android,lkwg82/syncthing-android,Nutomic/syncthing-android,syncthing/syncthing-android,wweich/syncthing-android,begetan/syncthing-android,jmintb/syncthing-android,Nutomic/syncthing-android,syncthing/syncthing-android,begetan/syncthing-android