Fix custom filter don't work when first click after back to original

clear current filter representation when run back to original

Change-Id: Ib07479dcc87a3c99e30f15bb41fe04cade841007
CRs-Fixed: 2099190

src/com/android/gallery3d/filtershow/FilterShowActivity.java

@@ -2425,6 +2425,7 @@ public class FilterShowActivity extends AbstractPermissionActivity implements On
         mMasterImage.setFusionUnderlay(null);
         mMasterImage.resetTranslation();
         mMasterImage.setScaleFactor(1);
+        mMasterImage.setCurrentFilterRepresentation(null);
         ArrayList<FilterRepresentation> frList = FiltersManager.getManager().getTools();
         for (FilterRepresentation fr : frList) {
             if (fr instanceof FilterRotateRepresentation) {