Don't add in an extra space when inserting a name into the string produced by...

Don't add in an extra space when inserting a name into the string produced by wp_comment_trashnotice(). props pavelevap, see #19788.

git-svn-id: https://core.svn.wordpress.org/trunk@19804 1a063a9b-81f0-0310-95a4-ce76da25c4cd