Provide more sensible default sort order for issues and merge requests
based on the following table:
| type | state | default sort order |
|----------------|--------|--------------------|
| issues | open | last created |
| issues | closed | last updated |
| issues | all | last created |
| merge requests | open | last created |
| merge requests | merged | last updated |
| merge requests | closed | last updated |
| merge requests | all | last created |
