[Catalog][SplitButton] Added an onDismissListener to the popup menu to synchronize menu display and button checked state.

PiperOrigin-RevId: 748755298

Author: kendrickumstattd

catalog/java/io/material/catalog/button/SplitButtonDemoFragment.java

@@ -84,6 +84,12 @@ private void showMenu(View v, @MenuRes int menuRes) {
               .show();
           return true;
         });
+    popup.setOnDismissListener(
+        popupMenu -> {
+          MaterialButton button =
+              (MaterialButton) v.findViewById(R.id.expand_more_or_less_filled_icon_popup);
+          button.setChecked(false);
+        });
     popup.show();
   }