remove player id from Schemas, fix archive bug (#907)

## Description:

Remove all references to playerID in the archive schema, since we
reference players by client id.
Also fixed the game not archiving bug, due to invalid reference.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

## Please put your Discord username so you can be contacted if a bug or
regression is found:

<DISCORD USERNAME>

src/client/SinglePlayerModal.ts

@@ -435,7 +435,6 @@ export class SinglePlayerModal extends LitElement {
             gameID: gameID,
             players: [
               {
-                playerID: generateID(),
                 clientID,
                 username: usernameInput.getCurrentUsername(),
                 flag: