check test: testSetTwitter

Test is failing:
```
org.junit.ComparisonFailure: expected:<[@]Nextclouders> but was:<[]Nextclouders>
at org.junit.Assert.assertEquals(Assert.java:117)
at org.junit.Assert.assertEquals(Assert.java:146)
at com.owncloud.android.lib.resources.users.SetUserInfoRemoteOperationIT.testSetTwitter(SetUserInfoRemoteOperationIT.java:143)
```

Has this maybe changed on server side?