Use EdgeInsets.zero instead of const EdgeInsets.all(0.0)

Author: danvick

lib/src/fields/form_builder_checkbox.dart

@@ -85,7 +85,7 @@ class FormBuilderCheckbox extends FormBuilderField<bool> {
     this.subtitle,
     this.secondary,
     this.controlAffinity = ListTileControlAffinity.leading,
-    this.contentPadding = const EdgeInsets.all(0.0),
+    this.contentPadding = EdgeInsets.zero,
     this.autofocus = false,
     this.tristate = false,
     this.selected = false,

lib/src/fields/form_builder_switch.dart

@@ -105,7 +105,7 @@ class FormBuilderSwitch extends FormBuilderField {
     this.subtitle,
     this.secondary,
     this.controlAffinity = ListTileControlAffinity.trailing,
-    this.contentPadding = const EdgeInsets.all(0.0),
+    this.contentPadding = EdgeInsets.zero,
     this.autofocus = false,
     this.selected = false,
   }) : super(