Fixed a problem with the category icon color in some setting situations

【Details of the fix】
■Fixed a bug that the main color is not applied to the icon color when “Category Color” is not set in the archive page.

The following are the files that have been modified for this update.
【Corrected files】
functions/category.php
style.css

For more information, please visit the MAG(tcd036) download site for purchasers.