Revert "Added WRITE_MEDIA_STORAGE permission (fixes #719)."
Revert "Added WRITE_MEDIA_STORAGE permission (fixes #719)."

This reverts commit 66597e9425437c891a86be5dca8ed6a56c33e429.

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