address comments

Author: yunhanw-google

src/app/ReadClient.cpp

@@ -493,14 +493,7 @@ void ReadClient::OnActiveModeNotification()
         return;
     }
 
-    if (mIsResubscriptionScheduled)
-    {
-        // If a subscription fails and resubscription is scheduled, a check-in message should cancel
-        // the pending resubscription and initiate a new subscription immediately."
-        mNumRetries = 0;
-        CancelResubscribeTimer();
-        TriggerResubscriptionForLivenessTimeout(CHIP_ERROR_TIMEOUT);
-    }
+    TriggerResubscribeIfScheduled("check-in message");
     return;
 }