Fix: Fix error in BBox 2D-WKT projection

CityDoctorParent/CityDoctorModel/src/main/java/de/hft/stuttgart/citydoctor2/datastructure/BoundingBox.java

@@ -177,8 +177,8 @@ public class BoundingBox {
     public String to2DWkt() {
         double x1 = bbox[0].getX();
         double y1 = bbox[0].getY();
-        double x2 = x1 + bbox[1].getX();
-        double y2 = y1 + bbox[1].getY();
+        double x2 = bbox[1].getX();
+        double y2 = bbox[1].getY();
 
         double minX = Math.min(x1, x2);
         double minY = Math.min(y1, y2);