fix test check

src/client/js/components/Admin/SlackIntegration/SlackIntegration.jsx

@@ -72,6 +72,7 @@ const SlackIntegration = (props) => {
     setIsRegisterSlackCredentials(false);
     setSlackSigningSecret('');
     setSlackBotToken('');
+    setIsSendTestMessage('');
     setSelectedBotType(clickedBotType);
   };