Avoid hotspot band updates when country code is inactive

- The SAP usable channels cannot be queried when the country code is not activated, causing UI to display wrong design

Bug: 280554293
Test: Manual test
atest -c WifiHotspotRepositoryTest

Change-Id: I58e8879438d7a630808aa2c4b69f21eb19968ab1

src/com/android/settings/wifi/repository/WifiHotspotRepository.java

@@ -102,7 +102,6 @@ public class WifiHotspotRepository {
     protected Boolean mIs6gBandSupported;
     protected Boolean mIs6gAvailable;
     protected MutableLiveData<Boolean> m6gAvailable;
-    protected String mCurrentCountryCode;
     protected ActiveCountryCodeChangedCallback mActiveCountryCodeChangedCallback;
 
     @VisibleForTesting
@@ -568,17 +567,12 @@ public class WifiHotspotRepository {
         @Override
         public void onActiveCountryCodeChanged(String country) {
             log("onActiveCountryCodeChanged(), country:" + country);
-            mCurrentCountryCode = country;
             purgeRefreshData();
             refresh();
         }
 
         @Override
         public void onCountryCodeInactive() {
-            log("onCountryCodeInactive()");
-            mCurrentCountryCode = null;
-            purgeRefreshData();
-            refresh();
         }
     }