Multiple bug fixes

【Contents of the fix】
■Update of Page Builder
・【Firefox、IE】Fixed a bug that caused unstable display of Google map.
・Fixed an issue with the editor switching in WordPress 5.5 and adjusted the CSS.
・Fixed a bug that the checkbox of the block border was removed when duplicating a block.
・Fixed other minor bugs.
■【iPhone】Fixed a bug where the Hatena bookmark icon did not appear on the share button in the fixed footer bar.
■SSL support for Google Custom Search widget.

The following are the files that have been modified for this update.

【Modified file】
css/footer-bar.css
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
widget/google_search.php

【Added files】
img/common/hatenabookmark-logomark.svg