Remove white-space 'pre-wrap'

[theunreal]

currently, it causes issues when clicking on elements below the input, and also in rendering of the mention window.

Fixes #ABC

What did you change (functionally and technically)?

Checklist (remove this list before you submit the PR)

• Are there tests for the new code?
• Does the code comply to our code conventions?
• Does the PR resolve the whole issue?

Additional review hints (remove this list before you submit the PR)

• Besides the code review, what should the reviewer test?
• Are there any edge cases?
• Do you have any test files or test set-up?
• Could your changes cause side effects elsewhere in the code base?

[vercel]

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[Sigrsig]

• Please provide further explanation of this fix. I'm not quite sure what issue it is supposed to be fixing.
• As it is currently, removing this code results in the mentions getting disarranged in textareas (see Vercel deployment) please revise