Multiple bug fixes

【Contents of the fix】
■Fixed a Notice error displayed in the settings screen when a new “PR List (tcd version)” widget is installed.
■Fixed the Notice error displayed in the comment field with comments in PHP7.4 environment.
■Adjusted the style of the theme options management screen.

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

【Modified files】
admin/my_admin.css
admin/theme-options.php
functions.php
functions/update_notifier.php
languages/ja.mo
languages/ja.po
style.css
widget/google_search.php
widget/pr_list.php

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