fix(terraform): make test case insensitive for CKV_ALI_35,CKV_ALI_36,CKV_ALI_37

[JamesWoolfenden]

Just made the base class use to lower case.

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Description

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• My code follows the style guidelines of this project
• 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 feature, policy, or fix is effective and works
• New and existing tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[gruebel]

💯

[gruebel]

@JamesWoolfenden can you add one test case for one of the checks?

[JamesWoolfenden]

added test