Fix/bug color palettes

[valterlorran]

Closes Automattic/themes#8553

Proposed changes:

• We got a report that the color palettes were not showing up for the user. Upon visiting the code, I noticed that a condition would not work if only three palettes were returned from the endpoint, as the code only worked for six or more palettes.
• I updated the conditions to accept three palettes.

Before:

After:

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

Does this pull request change what data or activity we track or use?

Testing instructions:

1. Create a new Business site, mark it as a WoA Dev site, and take it Atomic.
2. Apply this change to your Atomic site
3. Apply the Rockfield theme to your site.
4. Go to Appearance -> Customize -> Colors & Background.
5. You should now see the color palettes.

[github-actions]

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