fix tile type badness

library/DFTileTypes.cpp

@@ -409,7 +409,17 @@ bool isStairTerrain(int in)
 
     return false;
 }
-
+bool isOpenTerrain(int in)
+{
+    switch (in)
+    {
+        case 1: // slope down
+        case 32: //open space
+            return true;
+    }
+    return false;
+}
+/*
 bool isOpenTerrain(int in)
 {
     switch (in)
@@ -461,7 +471,7 @@ bool isOpenTerrain(int in)
         case 81: //featstone pillar
         case 82: //minstone pillar
         case 83: //frozen liquid pillar
-        */
+        *//*
         case 231: //sapling
         case 233: //ramp grass dry
         case 234: //ramp grass dead
@@ -554,8 +564,8 @@ bool isOpenTerrain(int in)
     }
 
     return false;
-}
-
+}*/
+/*
 int picktexture(int in)
 {
     switch ( in )
@@ -1036,7 +1046,7 @@ int picktexture(int in)
     }
 
     return 6;
-}
+}*/
 int getVegetationType(int in)
 {
     switch(in)