wifi: Handle wifi ap initial state before register intent

The intent WIFI_AP_STATE_CHANGED_ACTION is not sticky intent after
SC-V2, query wifi ap state and run intent handling after registering intent.

Bug: 231214355
Test: make RunSettingsRoboTests ROBOTEST_FILTER=Hotspot
Test: make RunSettingsRoboTests ROBOTEST_FILTER=Tether
Test: Manual test, the state shows correctly even if resume hotspot settings page from recent app.
Change-Id: Iab6b2b8628d725b003d5e5c4086420a329611745

src/com/android/settings/wifi/tether/WifiTetherSwitchBarController.java

@@ -93,6 +93,7 @@ public class WifiTetherSwitchBarController implements
         mSwitchBar.addOnSwitchChangeListener(this);
         mContext.registerReceiver(mReceiver, WIFI_INTENT_FILTER,
                 Context.RECEIVER_EXPORTED_UNAUDITED);
+        handleWifiApStateChanged(mWifiManager.getWifiApState());
     }
 
     @Override