fix(misconf): not to warn about missing selectors of libraries

[nikpivkin]

Description

This PR gets rid of those noisy messages for Rego libraries:

2024-10-03T08:53:28+06:00       WARN    [rego] Module has no input selectors - it will be loaded for all inputs!        file_path="Users/nikita/Library/Caches/trivy/policy/content/policies/test/lib/test.rego" module="Users/nikita/Library/Caches/trivy/policy/content/policies/test/lib/test.rego"
2024-10-03T08:53:28+06:00       WARN    [rego] Module has no input selectors - it will be loaded for all inputs!        file_path="Users/nikita/Library/Caches/trivy/policy/content/policies/cloud/lib/metadata.rego" module="Users/nikita/Library/Caches/trivy/policy/content/policies/cloud/lib/metadata.rego"

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).