Revert "Merge pull request #310 from jwplayer/feat/custom-reg-fields"

[dbudzins]

This reverts commit a04a63c7cf6e99f350d6347e8db51619df40d825, reversing changes made to 4b870cccaf20a8a47e0fb5d98bfe1638b92e2f79.

Steps completed:

According to our definition of done, I have completed the following steps:

~- [ ] Acceptance criteria met~ ~- [ ] Unit tests added~ ~- [ ] Docs updated (including config and env variables)~ ~- [ ] Translations added~

• [x] UX tested
• [x] Browsers / platforms tested
• [x] Rebased & ready to merge without conflicts
• [x] Reviewed own code

[github-actions[bot]]

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