Multiple bug fixes

【Contents of fix】
■Fixed a bug where the content of the title tag was not output when meta title was set.
■Fixed the bug that the title of the post is not displayed on the blog post list page and post details page.

The following are the files that have been modified for this update.
【Corrected files】
functions/seo.php
header.php
style_pc.css
style.css

For more information, please visit the download site for purchasers of LUXE (tcd022).

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