fix formik metadata reference according to new scheme

[ypatios]

Fixes #1518

"In the add event wizard, if a series is selected in the metadata tab, the respective ACL is copied to the new event and it's automatically set and visible in the ACL tab. The bug consists in that the above expected behaviour is broken (the series ACL does not get copied to the event ACL).

"It is assumed that this unintended behaviour was introduced with 25b77ad"

grok.com (v4.1, Expert Mode) has helped with analysis and coding.

[github-actions]

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[github-actions]

Use docker or podman to test this pull request locally.

Run test server using develop.opencast.org as backend:

podman run --rm -it -p 127.0.0.1:3000:3000 ghcr.io/opencast/opencast-admin-interface:pr-1519

Specify a different backend like stable.opencast.org:

podman run --rm -it -p 127.0.0.1:3000:3000 -e PROXY_TARGET=https://stable.opencast.org ghcr.io/opencast/opencast-admin-interface:pr-1519

It may take a few seconds for the interface to spin up.
It will then be available at http://127.0.0.1:3000.
For more options you can pass on to the proxy, take a look at the README.md.

[github-actions]

This pull request is deployed at test.admin-interface.opencast.org/1519/2026-03-13_06-58-15/ .
It might take a few minutes for it to become available.

[Arnei]

Urg, my changes were supposed to make these things happen less, not more :(

Anyway, this looks reasonable, thanks for fixing! I changed to the base to r/19.x as we surely want it in there, could you rebase on that?

[ypatios]

thx @Arnei :) did the rebase; all looking clean. @gregorydlogan, the ~48 irrelevant commits gone ;)
lmk if all good for merging.

[geichelberger]

The comment should be removed.

[ypatios]

fair point :) done