Make infill overlap depend on line width

Paul said this way was a better default for all our profiles.

Contributes to issue CURA-892.

resources/machines/fdmprinter.json

@@ -588,7 +588,7 @@
                     "default": 10,
                     "min_value": "0",
                     "max_value_warning": "100",
-                    "inherit_function": "10 if infill_sparse_density < 95 else 0",
+                    "inherit_function": "wall_line_width * 0.1",
                     "visible": false
                 },
                 "infill_wipe_dist": {