Remove enqueue of wp_plupload_default_settings() from admin_enqueue_scripts()....

Remove enqueue of wp_plupload_default_settings() from admin_enqueue_scripts(). For now, it needs to be enqueued selectively when needed. see #19910.

git-svn-id: https://core.svn.wordpress.org/trunk@20230 1a063a9b-81f0-0310-95a4-ce76da25c4cd