ui:preview Removed unused import.

src/main/java/com/owncloud/android/ui/preview/PreviewImageFragment.java

@@ -44,7 +44,6 @@ import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
-import android.view.View.OnClickListener;
 import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.LinearLayout;