Fix TowerGenerator.height

src/de/steamwar/towerrun/generator/TowerGenerator.java

@@ -79,6 +79,7 @@ public class TowerGenerator {
             int noKeyFloors;
 
             {
+                TowerGenerator.this.height = 0;
                 noBombFloors = random.nextInt(config.maxNoBombFloors - config.minNoBombFloors) + config.minNoBombFloors;
                 noKeyFloors = random.nextInt(config.maxNoKeyFloors - config.minNoKeyFloors) + config.minNoKeyFloors;
                 keys.clear();