Fix ban DM

[0xEmma]

Types of changes

What types of changes does your code introduce? Put an x in the boxes that apply.

• [ ] Bugfix (non-breaking change which fixes an issue).
• [x] New feature (non-breaking change which adds functionality).
• [ ] Breaking change (fix or feature that would cause existing functionality not to work as expected).
• [ ] Documentation Update (if none of the other choices applies).

Proposed changes

Call DM member prior to ban, since if called after it will always have a perm error due to no shared guild

Checklist

Put an x in the boxes that apply.

• [x] I have read and followed the CONTRIBUTING.md doc.
• [x] Lint and unit tests pass locally with my changes.
• [x] I have added the necessary documentation (if appropriate).

Additional context

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