Detect another staircase tagging variant

src/map-quick/floorlevelchangemodel.cpp

@@ -137,7 +137,8 @@ bool FloorLevelChangeModel::isLevelChangeElement(OSM::Element element) const
         || element.tagValue("building") == "elevator"
         || element.tagValue("room") == "elevator"
         || element.tagValue("levelpart") == "elevator_platform"
-        || (!element.tagValue("indoor").isEmpty() && element.tagValue("stairs") == "yes");
+        || (!element.tagValue("indoor").isEmpty() && element.tagValue("stairs") == "yes")
+        || element.tagValue("room") == "stairs";
 }
 
 void FloorLevelChangeModel::appendFloorLevel(int level)