[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

src/com/android/settings/wifi/ConfigureWifiEntryFragment.java

@@ -148,7 +148,7 @@ public class ConfigureWifiEntryFragment extends InstrumentedFragment implements
 
     @Override
     public void dispatchSubmit() {
-        // Do nothing
+        handleSubmitAction();
     }
 
     @Override