fix: multiple word resources bad cache hash

[adrianthedev]

Description

Fixes an issue where the file hash was badly compounded with multiple-word resources.

Avo::Resources::CourseLink would look for app/avo/resources/courese link.rb file which didn't exist.
Now it will look for app/avo/resources/courese_link.rb.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

[codeclimate]

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[github-actions]

This PR has been merged into main. The functionality will be available in the next release.

Please check the release guide for more information.