Add print style for panel

[bjosttveit]

Description

Padding and fontsize for panel is currently only defined for @media only screen, so I added a separate styling for @media print.

Panel currently looks like this when printing:

Related Issue(s)

• https://github.com/Altinn/app-frontend-react/issues/710
• https://github.com/Altinn/app-frontend-react/pull/736

Verification

• [x] Your code builds clean without any errors or warnings
• [x] Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)
• [x] All tests run green

Documentation

• User documentation is updated with a separate linked PR in altinn-studio-docs. (if applicable)

[codecov-commenter]

Codecov Report

Base: 94.04% // Head: 94.04% // No change to project coverage :thumbsup:

Coverage data is based on head (db49ba2) compared to base (bb5ce7f). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #249 +/- ## ======================================= Coverage 94.04% 94.04% ======================================= Files 82 82 Lines 1142 1142 Branches 339 339 ======================================= Hits 1074 1074 Misses 59 59 Partials 9 9 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Altinn). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Altinn)

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