Revert "Bug 1066149 - Make resizing work on bottom panel again"

This reverts commit 50e3b815e8f594580d72ebe148297d7b3ce7451f.
Bug 1066989 - Fix the treestatus and clobberer URLs for Thunderbird

Now that bug 1035222 has corrected the base repo name, the clobberer
workaround added by bug 1035220 must be removed - and the treestatus
name generation tweaked.