Fix: Draw overlays again, which was missing since r1745. Fixes parcels etc. not being displayed in the map editor. Fixes issue 1415.

(Note: Recompile not strictly necessary since nothing internal changed, but needed if you want the map editor to display stuff correctly again)

git-svn-id: http://corsix-th.googlecode.com/svn/trunk@1839 c39591fa-788f-11de-a72b-d90af8dea425