[Maintenance] Delete unused variables

[MatissJanis]

We currently use @typescript-eslint/no-unused-vars eslint rule which is enabled for most things. However, it is disabled for args.

The overall goal here would be to re-enable @typescript-eslint/no-unused-vars for args. Thus disallowing unuser arguments.

https://github.com/actualbudget/actual/blob/08c80b6f585eaa3237100972f0edc06e45e444d1/.eslintrc.js#L54

Please do not do this as one-big-bang migration.

[Sahad-09]

I'm working on it

[jaas666]

Sorry, didn't saw earlier that @Sahad-09 was working on this. Feel free to close my PR in favor of his.