feat: update autofill logic
feat: update autofill logic

- Only local topic users will show up if there is no search term
- Group matches now show up in the search results (whereas before
  they only showed up in the list with no search term). They will
  only show up in seach results, and not when there is just the
  naked "@" sign.
- Results are now alphabetically sorted (when there is a search
  term)

julianlam/nodebb-plugin-mentions