Multiple bug fixes

【Contents of the fix】
■Fixes to the output content of quick tags “heading h4” and “heading h5”.
■Fixed a bug that the content of the page builder was displayed in the header message section.
■Fixed a bug where the “Button Label” of the phone button was not reflected in the Site Basic Settings > Sidebar Settings.
■Fixed a bug in which the header logo was not displayed as text when viewed on a smartphone.

The following are the files that have been modified for this update.
【Modified file】
css/responsive.css
functions/custom_editor.php
header.php
style.css