[Fonts] Keep CardText call sites on the app font and fix px sizes

- CardText's unset fallback is qApp->font() again: only the three counter
  painters (paintNumberEllipse, GeneralCounter, PlayerCounter) were Serif
  before the role existed, and they now ask for it through
  ThemeManager::cardTextFont(). Card names, player names, counters, the
  overlay, the Archidekt and EDHREC labels and the completer delegate keep the
  app font they used before.
- Use setPixelSize for the EDHREC card name (20px) and commander name (28px)
  and details (16px) sizes: the stylesheets said px, and setPointSize made
  them about a third larger.

cockatrice/src/game_graphics/player/player_target.cpp

@@ -77,7 +77,7 @@ void PlayerCounter::paint(QPainter *painter, const QStyleOptionGraphicsItem * /*
 
     QRectF translatedRect = path.controlPointRect();
     QSize translatedSize = translatedRect.size().toSize();
-    QFont font = themeManager->appFont(AppFont::CardText);
+    QFont font = themeManager->cardTextFont();
     font.setWeight(QFont::Bold);
     font.setPixelSize(qMax(qRound(translatedSize.height() / 1.3), 9));
     painter->setFont(font);