adjust notification

src/client/js/components/Admin/Notification/SlackAppConfiguration.jsx

@@ -53,8 +53,8 @@ class SlackAppConfiguration extends React.Component {
                 {`Slack ${adminNotificationContainer.state.selectSlackOption}`}
               </button>
               <div className="dropdown-menu" aria-labelledby="dropdownMenuButton">
-                <a className="dropdown-item" onClick={() => adminNotificationContainer.switchSlackOption('Incoming Webhooks')}>Slack Incoming Webhooks</a>
-                <a className="dropdown-item" onClick={() => adminNotificationContainer.switchSlackOption('App')}>Slack App</a>
+                <a className="dropdown-item" type="button" onClick={() => adminNotificationContainer.switchSlackOption('Incoming Webhooks')}>Slack Incoming Webhooks</a>
+                <a className="dropdown-item" type="button" onClick={() => adminNotificationContainer.switchSlackOption('App')}>Slack App</a>
               </div>
             </div>
           </div>