Add back missing var definition in wplink.js, props TobiasBg, see #24067

git-svn-id: https://develop.svn.wordpress.org/trunk@27084 602fd350-edb4-49c9-b593-d223f7449a82
Minor cleanup (jshint) of wp-fullscreen.js and /wordpress/plugin.js, see #24067

git-svn-id: https://develop.svn.wordpress.org/trunk@27085 602fd350-edb4-49c9-b593-d223f7449a82