WebUI: Add torrents paused because of errors in Paused and Download list

Torrents paused because of errors are considered as torrents paused and in
download in the regular UI. Do the same in the WebUI for consistency.

Closes #2319.
Merge pull request #2320 from pmzqla/webui-pausederror

WebUI: Add torrents paused because of errors in Paused and Download list