FIX: remove stray and wrong pop commands in sqapi

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7006 8aca7d54-2c30-db11-9de9-000461428c89
FIX: No roadsigns on runways

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7007 8aca7d54-2c30-db11-9de9-000461428c89