[Wi-Fi] Fix check mark button when edit the password of a secured network.

Should handle WifiConfigUiBase#dispatchSubmit() for check mark button events.

Bug: 152144169
Test: make RunSettingsRoboTests ROBOTEST_FILTER=ConfigureWifiEntryFragmentTest
      make RunSettingsRoboTests ROBOTEST_FILTER=ConfigureAccessPointFragmentTest
Change-Id: I35cbc1cdd6fbef3fd51aaa8dec94722e4155b7f4

tests/robotests/src/com/android/settings/wifi/ConfigureWifiEntryFragmentTest.java

@@ -88,6 +88,13 @@ public class ConfigureWifiEntryFragmentTest {
         verify(mConfigureWifiEntryFragment).handleSubmitAction();
     }
 
+    @Test
+    public void dispatchSubmit_shouldHandleSubmitAction() {
+        mConfigureWifiEntryFragment.dispatchSubmit();
+
+        verify(mConfigureWifiEntryFragment).handleSubmitAction();
+    }
+
     @Test
     public void onClickCancelButton_shouldHandleCancelAction() {
         mConfigureWifiEntryFragment.getCancelButton().performClick();