Fix rticklabelsvisible and thetaticklabelsvisible in PolarAxis

[Klafyvel]

Description

Hi, I noticed earlier today that rticklabelsvisible and thetaticklabelsvisible were not functional in PolarAxis. Here is a quick fix.

This is my first PR to Makie.jl, so please do not hesitate to tell me if anything's wrong.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• Added an entry in NEWS.md (for new features and breaking changes)
• Added or changed relevant sections in the documentation
• Added unit tests for new algorithms, conversion methods, etc.
• Added reference image tests for new plotting functions, recipes, visual options, etc.

[jkrumbiegel]

Thanks!