[BUG] Textarea: missing resize handle

[x] I have written a good issue

Describe the bug

PR #3627 wrapped some CSS declarations in & {} to fix sass warnings. In certain scenarios this can lead to different order of declarations in the produced css output. For textarea this has resulted in the resize handle not being rendered on large screens.

Describe how to reproduce the bug

Go to https://cookbook.kirby.design/branch/kby-develop/#/home/showcase/form-field
Scroll down to 'Textarea'
See missing resize handle on textareas

Which Kirby version was used?

## What was the expected behavior?

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❌ Current:

✅ Expected:

Please complete the following information:

OS: [e.g. Windows, MacOS, iOS]
Browser [e.g. Chrome, Safari]
Browser version [e.g. 22]

Are there any additional context?

Checklist:

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Verification

To make sure the bug is not intended behaviour; it should be verified by a member of team Kirby before moving on to implementation.

[ ] Make sure the NOT verified label has been removed by a member of team Kirby; do not proceed until this is done.

Implementation

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[x] Make sure you have read: "Before you get coding".
[x] Signal to others you are working on the issue by assigning yourself.
[ ] Create a branch from the develop branch following our branch naming convention.
[ ] Create a test that reproduces the bug following guidelines in: "The good: Test".
[ ] Write code to fix the bug

Review

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[ ] Do a self-review.
[ ] Create a pull-request.

kirbydesign / designsystem