fix: add flex-shrink to radiobutton to avoid incorrect width in small containers

[aurorascharff]

Describe your changes

Add min width to radiobutton to avoid incorrect width in small containers

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• [x] I have performed a self-review and test of my code
• [x] I have added label to the PR (major, minor or patch)
• [ ] If new component: Is story for component created in stories-folder?
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[kajsaeggum]

flex-shrink: 0; på .md-radiobutton__check-area ville løst problemet ved at check-området ikke har lov å minke selv når container minker.

[aurorascharff]

flex-shrink: 0; på .md-radiobutton__check-area ville løst problemet ved at check-området ikke har lov å minke selv når container minker.

Aha! Da gjør jeg det isteden! Takk!