fix(types): improving indentNormalizer type check

Improving indentNormalizer type check, removing some ts-ignores.

Running all the checks, nothing functional.

[ ] I have included a changeset if this change will require a version change to one of the packages.
[x] 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
[x] I have run pnpm run check:ci and all checks pass
[ ] I have added tests that prove my fix is effective or that my feature works
[ ] My changes generate no new warnings
[ ] Any dependent changes have been merged and published in downstream modules

FormidableLabs / spectacle