(minor) warning due to _GLOBALS typo

With WP_DEBUG, a code typo shows up in Line 969 of embedplus.php, ver. 3.6.

if (empty($content_width))
    $content_width = $GLOBALS['content_width'];
 if (empty($content_width))
    $content_width = $_GLOBALS['content_width'];

The last two lines can be deleted, $_GLOBALS never exists.

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