VideoPress: do not use Jetpack redirect when site is not connected

There are WordPress guidelines to not show users links in “wp-admin” that look like taking you somewhere but then end up redirecting you to some other place.

Jetpack redirects to point to [jetpack.com](http://jetpack.com/) and then takes you somewhere else, so we should only do this for connected users.

No file or test is named. Start by locating the VideoPress link or Jetpack redirect entry point used in wp-admin, then trace how connection status is checked; done means unconnected users are not sent through the redirect while connected users retain the existing behavior.

Written by the indexing model from the issue text.