Multiple bug fixes

【Contents of the fix】
■Fixed a bug in the “Landing Page” template that the header of the child page would not be displayed when animation was selected in the header settings of the parent page.
(The header setting of the child page has been changed to follow the same setting of the parent page.)
■Corrected the output content of the quick tags “Heading h4” and “Heading h5”.
■【Mac】Fixed a bug in which the thickness of Japanese and European characters may be displayed differently when using some fonts.

The following files have been fixed in this update.
【Modified file】
functions.php
functions/custom_editor.php
functions/head.php
functions/loading_script.php
style.css