There's nothing in the early access site any more, so remove all refs to updates/earlyaccess/ site (JBT and devstudio) since this URL is now empty / 404'd.

> !MESSAGE No repository found at http://download.jboss.org/jbosstools/photon/staging/updates/earlyaccess/4.6.0.AM1/.

(There's no EA content for this release so far, so I need to adjust the system that publishes composite sites to remove refs to this site.)