feat(webui): make custom author roles consistent when editing book

[noaione]

Closes #935

Implemented to all views that dispatch dialogUpdateBooks.

New Behaviour:

• Book/Series: Shows all the added custom author roles by default
• Readlist/Search/Dashboard
  • Single: Shows all the added custom author roles on that series only (if it exist)
  • Multi: Check if the selected books is all from the same series, then shows all the added custom author roles on that series.

Tested on my local machine and it works as the above behavior intends.