Button component: merge provided className

[bjosttveit]

Description

Quick fix that merges className from props into button's classNames. Previously providing a custom className would override all styling since the restProps were inserted last.

Related Issue(s)

• Repeating groups: Replace table with components from design system app-frontend-react#580

[bjosttveit]

Looks quite funny though 😆

[codecov-commenter]

Codecov Report

Base: 93.57% // Head: 93.57% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (04dc3ec) compared to base (148de49).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #198   +/-   ##
=======================================
  Coverage   93.57%   93.57%           
=======================================
  Files          72       72           
  Lines         980      981    +1     
  Branches      281      281           
=======================================
+ Hits          917      918    +1     
  Misses         59       59           
  Partials        4        4           

Impacted Files	Coverage Δ
src/components/Button/Button.tsx	92.50% <100.00%> (+0.19%)	⬆️

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