Multiple bug fixes

【Contents of fixes】
■Updated page builder (compatible with WordPress 5.5)
■Fixed a bug that the “Free Space” content of the top page content builder was not responding.
■Fixed a minor bug.

The following files have been modified for this update.
【Fixed files】
admin/inc/top.php
inc/update_notifier.php
languages/ja.mo
languages/ja.po
pagebuilder/assets/admin/css/admin.css
pagebuilder/assets/admin/js/admin.js
pagebuilder/assets/admin/js/editor.js
pagebuilder/assets/admin/js/repeater.js
pagebuilder/assets/admin/js/slider.js
pagebuilder/modules/googlemap.php
pagebuilder/modules/slider.php
pagebuilder/modules/tab.php
pagebuilder/pagebuilder.php
style.css

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