Fixed a bug in the header function of the fixed page “Landing Page”

【Contents of the fix】
【Welcart Version / WooCommerce Version Common】
■Fixed a bug that when the “Heading Title (for mobile)” is entered in the “Header Image Settings” of the “Landing Page” fixed page, the same title is displayed in the “Description (for mobile)”.

The files that have been modified for this update are as follows
【Welcart Version / WooCommerce Version Common】
【Modified file】
functions/head.php
style.css