message: fix game grids complaining about duplicate keys
  Fixes:
diff: <template v-for="(game, i) of processedGames">
  <div class="game-grid-ad"
  v-if="shouldShowAd(i)"
  - :key="game.id"
  + :key="game.id + '-ad'"
  >
  <div class="game-grid-ad-inner">
  <app-ad size="rectangle" />
  