Hide "Create templates folder" option if templates are disabled

[pboguslawski]

Summary

When both skeletondirectory and templatedirectory are set to empty strings in configuration, templates folder creation should be disabled and no Create templates folder option should be present in new folder menu.

Related: #39266
Related: #46455
Author-Change-Id: IB#1156403

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[juliusknorr]

Thanks for your PR, I think the change makes sense, only eslint needs a small adjustment

[AndyScherzinger]

Also just a small thing, we went for the generic license header recently, so contributor attributions should go into the AUTHORS.md file, see https://docs.nextcloud.com/server/latest/developer_manual/getting_started/coding_standards/index.html#license-headers for details.

[pboguslawski]

License header removed. Linting fixed.

[AndyScherzinger]

perfect, thanks @pboguslawski 🙏 - Looks good to me 👍

By the way, you are a member of the Nextcloud Github organization, so you can also create branches and PRs on this repository. That way all Github actions will get executed. Just mentioning it since several actions are disabled on forks for security reasons.

[AndyScherzinger]

@pboguslawski I pushed your changes to #50464 so all CI checks can run and close this PR in favor of the local one 👍

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