Simplify `in_whitelisted_context` decorator API

The API of the `in_whitelisted_context` decorator was a bit clunky:

- The long parameter names frequently required multiline decorators

- Despite `#bot-commands` being the defacto default, it needed to be passed

- The name of the function, `in_whitelisted_context` is fairly long in itself

To shorten the call length of the decorator, the parameter names were shortened by dropping the `whitelisted_` prefix. This means that the parameter names are now just `channels`, `categories`, and `roles`. This already means that all current usages of the decorator are reduced to one line.

In addition, `#bot-commands` has now been made the default redirect channel for the decorator. This means that if no `redirect` was passed, users will be redirected to `bot-commands` to use the command. If needed, `None` (or any falsey value) can be passed to disable redirection. Passing another channel id will trigger that channel to be used as the redirection target instead of bot-commands.

Finally, the name of the decorator was shortened to `in_whitelist`, which already communicates what it is supposed to do.

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