Applied ability to set as wallpaper from properties of a picture

Signed-off-by: Kilian Périsset <kilian.perisset@infomaniak.com>

src/main/java/com/owncloud/android/ui/fragment/FileDetailFragment.java

@@ -468,6 +468,10 @@ public class FileDetailFragment extends FileFragment implements OnClickListener,
                 containerActivity.getFileOperationsHelper().syncFile(getFile());
                 return true;
             }
+            case R.id.action_set_as_wallpaper:  {
+                containerActivity.getFileOperationsHelper().setPictureAs(getFile(), getView());
+                return true;
+            }
             case R.id.action_encrypted: {
                 // TODO implement or remove
                 return true;