Jetpack: MP6 Merge Stuff: Make sure we're hiding the :before if it's pre-mp6

git-svn-id: https://plugins.svn.wordpress.org/jetpack/trunk@807772 b8457f37-d9ea-0310-8a92-e5e31aec5664
Jetpack: MP6 Merge Stuff: Aaaaand, missed a space.

git-svn-id: https://plugins.svn.wordpress.org/jetpack/trunk@807773 b8457f37-d9ea-0310-8a92-e5e31aec5664