Multiple bug fixes

【Contents of the fix】
■Fixed a bug in which Welcart’s custom fields were not being output.
■Fixed a bug that the quantity of products in the cart list page could not be changed depending on the browser width (smartphone size).
■Adjusted the header cart area when displayed on a smartphone.

The following are the files that have been modified for this update.
【Corrected files】
wc_templates/wc_item_single.php
wc_templates/wc_item_single_data.php
wc_templates/wc_item_single_service.php
wc_templates/wc_sku_select.php
wc_templates/wc_sku_select_data.php
wc_templates/wc_sku_select_service.php
style.css

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