Loss condition does not trigger in 2048-expert

[JosiahBull]

While playing 2048, I entered a loss condition in which I could not make any further moves. I was not presented with an error alert/didn't have the game reset.

Browser information
Firefox 102.0.1 (64-bit)

Steps to reproduce

• run npm start
• visit http://localhost:1234/2048-expert/index.html
• play by randomly pressing keys until the arena is completely filled

Potential cause of the bug
The checkLoss() functionality to check if there is a valid move remaining has introduced a bug in which the game cannot be lost.

Screenshots

[lche262]

Approve!