Multiple bug fixes

【Contents of the fix】
■Fixed an error related to the login judgment in the comment section.
■Corresponded to the specification change of social button type 5 (official button) “Facebook Like Button”.
■Removed “Google+” from the settings of social buttons that are no longer in service.
■Page builder has been updated.
・【Firefox, IE】Fixed the problem of Google map display instability.
・Fixed the problem of switching editors and adjusted CSS in WordPress 5.5.
・Fixed a bug that the checkbox of the block border was removed when duplicating a block.
・Fixed other minor bugs.
■Adjusted the style of the top page free space.
■【iPhone】Fixed a bug that the Hatena bookmark icon does not appear on the share button in the fixed footer bar.

The following files have been modified for this update.

【Modified file】
admin/inc/basic.php
admin/theme-options.php
comments.php
css/footer-bar.css
css/footer-bar.min.css
functions/head.php
functions/update_notifier.php
languages/ja.mo
languages/ja.po
pagebuilder/assets/admin/css/admin.css
pagebuilder/assets/admin/js/admin.js
pagebuilder/modules/googlemap.php
pagebuilder/modules/simple_table.php
pagebuilder/modules/slider.php
pagebuilder/pagebuilder.php
style.css
template-parts/footer-bar.php
template-parts/sns-btn-btm.php
template-parts/sns-btn-top.php

【Added files】
img/hatenabookmark-logomark.svg