Bug: Fix conversation not loading from the links in email (#602)

Bug: Load conversation from links

app/javascript/dashboard/api/inbox/message.js

@@ -15,7 +15,7 @@ class MessageApi extends ApiClient {
   }
 
   getPreviousMessages({ conversationId, before }) {
-    return axios.get(`${this.url}/${conversationId}`, {
+    return axios.get(`${this.url}/${conversationId}/messages`, {
       params: { before },
     });
   }