use correct api endpoint to fetch user

app/src/providers/twitter-api/twitter-api.ts

@@ -33,8 +33,8 @@ export class TwitterApiProvider {
   }
 
   public async fetchUser(userId) {
-    const res = await this.client.get("users/lookup", { user_id: userId });
-    return res.data[0];
+    const res = await this.client.get("users/show", { user_id: userId });
+    return res.data;
   }
 
   public async fetchUserTimeline(userId, maxId?) {