FileDisplayActivity: Preserve title bar after resume

Fixes title bar reverting to searchbar even if the resumed fragment is the preview or the details fragments

Signed-off-by: Álvaro Brey Vilas <alvaro.brey@nextcloud.com>

src/main/java/com/owncloud/android/ui/activity/FileDisplayActivity.java

@@ -1168,7 +1168,11 @@ public class FileDisplayActivity extends FileActivity
             localBroadcastManager.registerReceiver(mSyncBroadcastReceiver, syncIntentFilter);
         }
 
+
         if (!(leftFragment instanceof OCFileListFragment)) {
+            if (leftFragment instanceof FileFragment) {
+                super.updateActionBarTitleAndHomeButton(((FileFragment) leftFragment).getFile());
+            }
             return;
         }