fix: initial layer line width factor is not a specialization of the line width any more

They are not even in the same unit, so it cannot be a child.
A parent setting should be exactly equal to all child settings combined.

resources/definitions/fdmprinter.def.json

@@ -961,6 +961,8 @@
                             "maximum_value_warning": "2 * machine_nozzle_size",
                             "settable_per_mesh": false,
                             "settable_per_extruder": true
+                        }
+                    }
                 },
                 "initial_layer_line_width_factor":
                 {
@@ -975,8 +977,6 @@
                     "settable_per_extruder": true
                 }
             }
-                }
-            }
         },
         "shell":
         {