Fix Tradiio connector
Fix Tradiio connector

getTrack function fails because coverart is not displayed
on Tradiio page anymore. Remove it.

alexsh/web-scrobbler,david-sabata/web-scrobbler,fakelbst/Chrome-Last.fm-Scrobbler,Paszt/web-scrobbler,ex47/web-scrobbler,usdivad/web-scrobbler,alexesprit/web-scrobbler,galeksandrp/web-scrobbler,inverse/web-scrobbler,ex47/web-scrobbler,usdivad/web-scrobbler,alexsh/web-scrobbler,carpet-berlin/web-scrobbler,david-sabata/web-scrobbler,alexesprit/web-scrobbler,carpet-berlin/web-scrobbler,galeksandrp/web-scrobbler,inverse/web-scrobbler,fakelbst/Chrome-Last.fm-Scrobbler,Paszt/web-scrobbler