Refresh UI only when changes are detected on the server

Signed-off-by: Dariusz Olszewski <starypatyk@users.noreply.github.com>

app/src/main/java/com/owncloud/android/operations/RefreshFolderOperation.java

@@ -252,7 +252,7 @@ public class RefreshFolderOperation extends RemoteOperation {
             mStorageManager.saveFile(mLocalFolder);
         }
 
-        if (!mSyncFullAccount) {
+        if (!mSyncFullAccount && mRemoteFolderChanged) {
             sendLocalBroadcast(
                 EVENT_SINGLE_FOLDER_CONTENTS_SYNCED, mLocalFolder.getRemotePath(), result
             );