Multiple bug fixes

【Contents of the fix】
■Corrected the output content of the quick tags “Heading h4” and “Heading h5”.
■Social Button Type 5 (Official Button) “Facebook Like Button” specification change support.

The following files have been modified for this update.
【Modified File】
functions/custom_editor.php
style.css
template-parts/sns-btn-btm.php
template-parts/sns-btn-top.php

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