Fix recaptcha missing due to plugin change

[cdrini]

Closes #11879 . Remove reliance on the dynamic construction of import paths, which feels like an anti-pattern.

Technical

Testing

Confirmed the recaptcha code appears on https://testing.openlibrary.org/account/create

Screenshot

Stakeholders

@mekarpeles @RayBB

[RayBB]

I don't think I can test but I strongly agree.

This is also the general approach I'm moving towards via this plugins refactor (which we should carefully check)
#11762

[Copilot]

Pull request overview

This PR fixes a broken registration button by removing unnecessary plugin existence checks that were preventing recaptcha from being properly initialized. The issue was that the is_plugin_enabled() function was checking whether plugins were dynamically loaded, but the recaptcha configuration is always available in the config file.

Changes:

• Removed is_plugin_enabled() helper function and its usage in both account creation and book addition flows
• Simplified recaptcha initialization by directly checking for valid config keys instead of checking plugin loading status

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
openlibrary/plugins/upstream/addbook.py	Removed is_plugin_enabled() function and simplified get_recaptcha() to check only recaptcha_exempt() before accessing config
openlibrary/plugins/upstream/account.py	Removed is_plugin_enabled() method from account_create class and simplified get_recap() to directly access config keys

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