fix: subcommands inherit their parent's whitelist

[onerandomusername]

Relevant Issues

https://discord.com/channels/267624335836053506/635950537262759947/920817429301579807

Additionally, does what #944 was supposed to do.

Description

solves issue with adding decorator to the parent which wouldn't apply to the children

Essentially, whitelists for parent commands now apply to child commands

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Given the reviews on #944, @ChrisLovering, @Xithrius

[Xithrius]

@onerandomusername conflicts.

[Xithrius]

@onerandomusername Status?