Fix linting issues in thankyou.js

[RedFox0x20]

This should have fixed the linting issues mentioned in #78 It is preferable to merge this first so that the form functionality in #78 can be checked on the Netlify host as the donate button does not work in my local instance.

[netlify]

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[audreyfeldroy]

Thanks a ton for catching this and submitting a fix @RedFox0x20. I realize I should have linted and run Prettier manually when reviewing that PR.

[audreyfeldroy]

I also really appreciate the fact that you made this a separate atomic PR. That really helped me review this and get it in fast.

[RedFox0x20]

No worries! Considered what you had mentioned in a previous message regarding PR scopes, thought it seemed the best way to go through.