fix(ThreadMember): remove audit log reason parameter

[Renegade334]

Please describe the changes this PR makes and why it should be merged: The Add Thread Member and Remove Thread Member endpoints do not create audit log entries, and therefore do not accept the X-Audit-Log-Reason header.

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating
• This PR includes breaking changes (methods removed or renamed, parameters moved or removed)

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[Jiralite]

Please resolve conflicts!

[Renegade334]

Will rebase when I get the chance. 👍