Addon blocks with text input have a black border when editing

[wesleybl]

Describe the bug
Addon blocks with text input have a black border when editing.

To Reproduce
Steps to reproduce the behavior:

1. In an addon, create a block, like Volto's title block.
2. When editing content, add the created block.
3. Place focus on the field to enter text.
4. See the black border around the field

Expected behavior
The black border should not appear.

Screenshots
If applicable, add screenshots to help explain your problem.

Software (please complete the following information):

• OS: Ubuntu 22
• Browser Chrome
• Volto Version 18.0.0-alpha.21
• Plone Version 6.0.10
• Plone REST API Version 9.5.0

Additional context
This does not occur in Volto blocks because it is removed via CSS:

volto/packages/volto/theme/themes/pastanaga/extras/blocks.less

Lines 45 to 52 in accb714

	.block-editor-title,
	.block-editor-slate,
	.block-editor-slateTable,
	.slate-editor.selected {
	:focus-visible {
	outline: none;
	}
	}

Ref: #5186