Fixed bug signature pad not working - unmodifiable list

Author: danvick

lib/src/fields/form_builder_signature_pad.dart

@@ -33,7 +33,7 @@ class FormBuilderSignaturePad extends StatefulWidget {
     this.penStrokeWidth = 3.0,
     this.clearButtonText = "Clear",
     this.initialValue,
-    this.points = const [],
+    this.points,
     this.width,
     this.height = 200,
     this.valueTransformer,

lib/src/widgets/signature.dart

@@ -105,7 +105,7 @@ class SignatureState extends State<Signature> {
     );
 
     if (widget.width != null || widget.height != null) {
-      //IF DOUNDARIES ARE DEFINED, USE LIMITED BOX
+      //IF BOUNDARIES ARE DEFINED, USE LIMITED BOX
       return Center(
         child: LimitedBox(
           maxWidth: maxWidth,