skip minorticks when they are not shown

[ffreyer]

Description

Fixes #4608

Skips minortick generation when they are not shown.

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist

• Added an entry in CHANGELOG.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.

[ffreyer]

I checked that

f = Figure(size = (200, 200))
a = Axis(f[1, 1], yticksmirrored = true, yticksize = 10, ytickwidth = 4, spinewidth = 5, yminortickcolor = :red)
Colorbar(f[1, 2])
display(f)
a.yminorticksvisible[] = true

works without update problems

[MakieBot]

Benchmark Results

SHA: ff7099edb424b7e894531a1c6e2ae603f673e86e

Warning

These results are subject to substantial noise because GitHub's CI runs on shared machines that are not ideally suited for benchmarking.

[ffreyer]

May help #4593