[openstreetmap-website] Refactoring has broken Callback URL which used to allow custom URL schemes (#1019)

[jamba-ca]

It looks [this refactoring](https://github.com/openstreetmap/openstreetmap-website/commit/dbe165bbb3d6eda37d9579f1ac767599f9055607#diff-3ef1e2237f323b7d4dc1ce1fc11a5c20R13) has broken what used to be a very useful feature: Allowing the submission of a Callback URL with a custom URL scheme (e.g., myapp://somewhere) when creating an app. It's now back to limiting Callback URLs to http/https.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/1019
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