Disable Connect Infill Lines when using gradual infill

Gradual infill causes infill to break up into lots of different areas with different infill densities. Because Connect Infill Lines connects those lines along the border of an infill area, you sometimes get very thin areas with lots of lines going back and forth connecting extremely thin pieces of infill. Sometimes it works fantastically (esp. with mechanical models) but sometimes it really messes up the print.

Contributes to issue CURA-5319.

resources/definitions/ultimaker3.def.json

@@ -154,6 +154,6 @@
         "wall_0_inset": { "value": "0" },
         "wall_line_width_x": { "value": "round(wall_line_width * 0.3 / 0.35, 2)" },
         "wall_thickness": { "value": "1" },
-        "zig_zaggify_infill": { "value": "True" }
+        "zig_zaggify_infill": { "value": "gradual_infill_steps == 0" }
     }
 }

resources/definitions/ultimaker_s5.def.json

@@ -154,6 +154,6 @@
         "optimize_wall_printing_order": { "value": "True" },
         "retraction_combing": { "default_value": "all" },
         "initial_layer_line_width_factor": { "value": "120" },
-        "zig_zaggify_infill": { "value": "True" }
+        "zig_zaggify_infill": { "value": "gradual_infill_steps == 0" }
     }
 }