Use model more similar to the one in PriorKnowledgeData

VirtualRobot/data/images/Floor20x20.mtl

-# Blender MTL File: 'Floor20x20.blend'
+# Blender MTL File: 'floor-20x20.blend'
 # Material Count: 1
 
 newmtl material

VirtualRobot/data/images/Floor20x20.obj

-# Blender v3.4.1 OBJ File: 'Floor20x20.blend'
+# Blender v3.4.1 OBJ File: 'floor-20x20.blend'
 # www.blender.org
 mtllib Floor20x20.mtl
 o Plane
@@ -6,10 +6,10 @@ v -10.000000 10.000000 0.000000
 v -10.000000 -10.000000 0.000000
 v 10.000000 10.000000 0.000000
 v 10.000000 -10.000000 0.000000
-vt 0.003998 0.003998
-vt 39.996002 0.003998
-vt 39.996002 39.996002
-vt 0.003998 39.996002
+vt -18.996002 -18.996002
+vt 20.996002 -18.996002
+vt 20.996002 20.996002
+vt -18.996002 20.996002
 vn 0.0000 0.0000 1.0000
 usemtl material
 s off