menu item only visible for images

src/com/owncloud/android/files/FileMenuFilter.java

@@ -244,7 +244,7 @@ public class FileMenuFilter {
         }
 
         // SET PICTURE AS
-        if (mFile == null || (!mFile.isAudio() && !mFile.isVideo())){
+        if (mFile == null || !mFile.isImage()){
             toHide.add(R.id.action_set_as_wallpaper);
         } else {
             toShow.add(R.id.action_set_as_wallpaper);