publicsenat.json: Add thumbnail_url
publicsenat.json: Add thumbnail_url

hadess/libquvi-scripts-iplayer,DangerCove/libquvi-scripts,hadess/libquvi-scripts-iplayer,legatvs/libquvi-scripts,alech/libquvi-scripts,legatvs/libquvi-scripts,DangerCove/libquvi-scripts,alech/libquvi-scripts