bugfix/KAD-4080

[gilbert-hernandez]

🎫 #[Jira Ticket]
https://stellarwp.atlassian.net/browse/KAD-4080
...

Checklist

• I have performed a self-review.
• No unrelated files are modified.
• No debugging statements exist (Ex: console.log, error_log).
• There are no warnings or notices in the wordpress error log.
• Passes all tests (linting, acceptance, & unit)

Block specific checklist (where relevant)

• Tested with an existing instance of this block .
• Tested creating a new instance of this block.
• Tested with Dynamic content & Elements.

[gilbert-hernandez]

If a buttons block included an icon and had its color set using KB v3.2.53 or earlier, updating the plugin caused the icon color to mismatch the button text in the editor. This fix ensures that icon colors now match the current text color for buttons created with version 3.2.53 or earlier.