Multiple bug fixes

【Contents of the fix】
■Fixed an issue where the display order of articles in the “Thumbnail List” widget was not reflected.
■Fixed an error related to the login judgment in the comment section.
■Social Button Type 5 (Official Button) “Facebook Like Button” specification change support.
■Removed “Google+” from the social button settings.

The following files have been modified for this update.

【Modified file】
admin/inc/basic.php
comments.php
inc/widgets/thumbnail_list.php
style.css
template-parts/sns-btn-btm.php
template-parts/sns-btn-top.php