#10012: fix glitch with the #prefs form in the TracRoadmap
#10012: fix glitch with the #prefs form in the TracRoadmap

In a narrow window, this could collide with the % number of the first milestone and either cover it or make it move //above// the progress bar.
pkdevbox/trac,pkdevbox/trac,pkdevbox/trac,pkdevbox/trac