Unsaved carrier wifi connection should display carrier in summary

Autoconnected carrier wifi should display "Connected via <carrier>"
in the wifi picker even if the network has not been saved.

Bug: 134525097
Test: atest AccessPointTest
Change-Id: Id28daec3f80124f5329386ef5ff2b32cda505355

packages/SettingsLib/src/com/android/settingslib/wifi/AccessPoint.java

@@ -999,8 +999,7 @@ public class AccessPoint implements Comparable<AccessPoint> {
                 summary.append(mContext.getString(R.string.tap_to_sign_up));
             }
         } else if (isActive()) {
-            if (mConfig != null && getDetailedState() == DetailedState.CONNECTED
-                    && mIsCarrierAp) {
+            if (getDetailedState() == DetailedState.CONNECTED && mIsCarrierAp) {
                 // This is the active connection on a carrier AP
                 summary.append(String.format(mContext.getString(R.string.connected_via_carrier),
                         mCarrierName));