Search Block: Fix bug with missing color when border color added

[stacimc]

Description

There was a bug with the Search block color supports due to a missing space between generated class names for color and border color. If a named background color and a named border color were applied to the same Search block, it would appear correctly in the editor but the background color would not be applied properly on the frontend.

How has this been tested?

Manually.

1. Create a post and insert a Search block.
2. Select one of the preset values for background color.
3. Select one of the preset values for border color.
4. Save the post and view on the frontend.
5. Verify that the colors and background colors have persisted.

Screenshots

Types of changes

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• 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 (please manually search all *.native.js files for terms that need renaming or removal).

[ramonjd]

Thanks for the quick fix!

Tests well for me, the border color class names are now socially distancing themselves as they should.

In the editor:

Before this change:

After this change:

[andrewserong]

This LGTM, too, thanks for the fix @stacimc!

Before:

After: