Remove unnecessary comments in `Card` class

[eganjs]

These comments should be removed unless the functionality of the code in question is unclear

https://github.com/hammundo/BlackjackAndroidApp/blob/ad6deed5bc1c8bceb7ec8ea49605dc0b2403ae7e/app/src/main/java/com/example/blackjack_android_app/Card.java#L5