feat(library): show set total playtime on dashboard cards

Most played and currently playing cards show the total playtime of
the game set. Use the own minutes when the API sends no total.

src/components/CurrentlyPlayingCard.jsx

@@ -40,7 +40,7 @@ export default function CurrentlyPlayingCard({games, syncing, wide}) {
                                     <FitText text={g.name ?? `App ${g.appid}`}/>
                                 </div>
                                 <div className="text-xs text-muted-foreground tabular-nums">
-                                    {formatPlaytime(g.playtimeMinutes)}
+                                    {formatPlaytime(g.totalPlaytimeMinutes ?? g.playtimeMinutes)}
                                 </div>
                             </Link>
                         </li>