Remove the @Ignore annotation on testAvoidBadWifi

testAvoidBadWifi could pass without issue. The refactor should
also be done. The test does not need to be ignored now. Remove
the annotation to bring the test coverage back.

Bug: 178071397
Test: atest ConnectivityServiceTest
Change-Id: I5652fa817f16b8c241f1e2066a0b04ad2156a3b7

tests/unit/java/com/android/server/ConnectivityServiceTest.java

@@ -4795,7 +4795,6 @@ public class ConnectivityServiceTest {
         testAvoidBadWifiConfig_controlledBySettings();
     }
 
-    @Ignore("Refactoring in progress b/178071397")
     @Test
     public void testAvoidBadWifi() throws Exception {
         final ContentResolver cr = mServiceContext.getContentResolver();