CODEBASE: Fix lint errors 4

[catloversg]

This is a part of the series of PRs for #1730. The code in this PR is contributed by @ficocelliguy. Thank you.

I rebased catloversg#2 to dev. While doing that, there is a small conflict:
ficocelliguy's code:

if (currentGame.previousPlayer === GoColor.black && currentGame.ai !== GoOpponent.none) {
  makeAIMove(currentGame).catch((e) => showError(`Error while making first IPvGO AI move: ${e}`));
}

I changed it to:

if (currentGame.previousPlayer === GoColor.black && currentGame.ai !== GoOpponent.none) {
  makeAIMove(currentGame).catch((error) => {
    showError(new Error(`Error while making first IPvGO AI move: ${error}`, { cause: error }));
  });
}

Code of showError:

function showError(error: unknown): boolean {
  console.warn("Encountered the following issue while loading Go savedata:");
  console.error(error);
  console.warn("Savedata:");
  console.error(data);
  return false;
}