Fixed a bug in meta title of fixed pages and an error that occurs in PHP7

【Contents of the fix】
■Fixed the bug that meta title of fixed page is not output correctly.
■Fixed an error that occurs in PHP7.

The following are the files that have been modified for this update.
【Corrected files】
functions/footer-logo.php
functions/seo.php
page-welcome.php
single.php
footer.php
header-no-sidebar.php
style.css

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