Reduced horizontal expansion offset to the theoretically correct value of 0.1*layer_height if the correction is performed on both sides of the wall (then totals 0.2*layer_height).

Relates to PP-154

resources/definitions/ultimaker.def.json

@@ -81,7 +81,7 @@
             "value": "math.ceil(round(bottom_thickness / resolveOrValue('layer_height'), 4))"
         },
         "xy_offset": {
-            "value": "-layer_height * 0.2"
+            "value": "-layer_height * 0.1"
         }
     }
 }