increase support horizontal expansion

A bigger horizontal expansion is improving the stability of the support structure. Setting the Support Horizontal Expansion > Support X/Y distance causes the support folding around the object, making it way harder to remove and introducing a lot of additional stringing. PP-185

resources/definitions/ultimaker.def.json

@@ -233,7 +233,7 @@
             "value": "2*layer_height"
         },
         "support_offset": {
-            "value": "2*line_width if support_interface_enable else 0"
+            "value": "support_xy_distance if support_interface_enable else 0"
         },
         "support_xy_distance": {
             "value": "1"