handle multiple artists properly in UI

ui/browsing/artistpage.go

@@ -189,7 +189,7 @@ func (a *ArtistPage) showAlbumGrid() {
 				Name:       al.Name,
 				ID:         al.ID,
 				CoverArtID: al.CoverArtID,
-				Secondary:  strconv.Itoa(al.Year),
+				Secondary:  []string{strconv.Itoa(al.Year)},
 			}
 		})
 		if g := a.pool.Obtain(util.WidgetTypeGridView); g != nil {

ui/browsing/artistspage.go

@@ -158,7 +158,7 @@ func createArtistsGridViewModel(artists []*mediaprovider.Artist) []widgets.GridV
 			Name:       ar.Name,
 			ID:         ar.ID,
 			CoverArtID: ar.CoverArtID,
-			Secondary:  fmt.Sprintf("%d %s", ar.AlbumCount, albums),
+			Secondary:  []string{fmt.Sprintf("%d %s", ar.AlbumCount, albums)},
 		}
 	})
 }

ui/browsing/favoritespage.go

@@ -333,7 +333,7 @@ func buildArtistGridViewModel(artists []*mediaprovider.Artist) []widgets.GridVie
 			ID:         ar.ID,
 			CoverArtID: ar.CoverArtID,
 			Name:       ar.Name,
-			Secondary:  fmt.Sprintf("%d %s", ar.AlbumCount, albums),
+			Secondary:  []string{fmt.Sprintf("%d %s", ar.AlbumCount, albums)},
 		})
 	}
 	return model

ui/browsing/playlistspage.go

@@ -175,7 +175,7 @@ func createPlaylistGridViewModel(playlists []*mediaprovider.Playlist) []widgets.
 			Name:       pl.Name,
 			ID:         pl.ID,
 			CoverArtID: pl.CoverArtID,
-			Secondary:  fmt.Sprintf("%d %s", pl.TrackCount, tracks),
+			Secondary:  []string{fmt.Sprintf("%d %s", pl.TrackCount, tracks)},
 		}
 	})
 }