Allow projectiles to go through terrain again.

Reverts part of 08f9fa5.

Closes #2386.

Author: cybersphinx

src/map.c

@@ -587,10 +587,10 @@ extern BOOL mapObjIsAboveGround( BASE_OBJECT *psObj )
 			tileY = map_coord(psObj->pos.y),
 			tileYOffset1 = (tileY * mapWidth),
 			tileYOffset2 = ((tileY+1) * mapWidth),
-			h1 = psMapTiles[MIN(mapWidth * mapHeight, tileYOffset1 + tileX)    ].height * ELEVATION_SCALE,
-			h2 = psMapTiles[MIN(mapWidth * mapHeight, tileYOffset1 + tileX + 1)].height * ELEVATION_SCALE,
-			h3 = psMapTiles[MIN(mapWidth * mapHeight, tileYOffset2 + tileX)    ].height * ELEVATION_SCALE,
-			h4 = psMapTiles[MIN(mapWidth * mapHeight, tileYOffset2 + tileX + 1)].height * ELEVATION_SCALE;
+			h1 = psMapTiles[MIN(mapWidth * mapHeight, tileYOffset1 + tileX)    ].height,
+			h2 = psMapTiles[MIN(mapWidth * mapHeight, tileYOffset1 + tileX + 1)].height,
+			h3 = psMapTiles[MIN(mapWidth * mapHeight, tileYOffset2 + tileX)    ].height,
+			h4 = psMapTiles[MIN(mapWidth * mapHeight, tileYOffset2 + tileX + 1)].height;
 
 	/* trivial test above */
 	if ( (psObj->pos.z > h1) && (psObj->pos.z > h2) &&