Verse block: fix white space

[ellatrix]

Description

Fixes #19083. Since #18372, the verse block uses character line breaks instead of element line breaks. Unfortunately, I seem to have missed correcting the styles on the front end to be pre-style.

How has this been tested?

Create a verse block with two lines. View the front end. There should be two lines.

Screenshots

Types of changes

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR. .

[mcsf]

I'm surprised we both missed this 😓 — LGTM!