Multiple bug fixes

【Contents of the fix】
■Fixed a bug that only one category is displayed on the right side of the post screen when using the Gutenberg editor.
■Fixed a bug where the title would return to “Show” after closing the page even if it was set to “Hide Title” on the fixed page.
■Fixed an issue where an error would appear in footer ads (for smartphones).
■Corrected the output content of “og:url” in OGP.
■Fixed an issue where the “Show date” checkbox could not be unchecked in the widget “Designed article list (tcd) version”.

The files that have been modified for this update are as follows
【Corrected files】
functions/ogp.php
functions/page_cf.php
widget/styled_post_list1.php
footer.php
functions.php
style.css