fix validation edge cases when applying payment request (#3063)

lib/new-ui/pages/send_page.dart

@@ -687,6 +687,12 @@ class _NewSendPageState extends State<NewSendPage> {
   void _handleSend() async {
     //TODO refactor this action. code was copied over from old ui. i don't like it.
 
+    for(int i=0; i<widget.sendViewModel.outputs.length; i++) {
+      if(i < _amountControllers.length) {
+        widget.sendViewModel.outputs[i].cryptoAmount = _amountControllers[i].text;
+      }
+    }
+
     if (_formKey.currentState != null && !_formKey.currentState!.validate()) {
       if (widget.sendViewModel.outputs.length > 1) {
         showErrorValidationAlert(context);

lib/new-ui/widgets/send_page/send_address_input.dart

@@ -70,6 +70,7 @@ class _NewSendAddressInputState extends State<NewSendAddressInput> {
           : EdgeInsets.zero,
       child: FormField<String>(
         key: formFieldKey,
+        initialValue: widget.addressController.text,
         validator: widget.validator,
         builder: (state) => Column(
           crossAxisAlignment: CrossAxisAlignment.start,

lib/new-ui/widgets/send_page/send_amount_input.dart

@@ -39,6 +39,7 @@ class _NewSendAmountInputState extends State<NewSendAmountInput> {
   Widget build(BuildContext context) {
     return FormField<String>(
       key: formFieldKey,
+      initialValue: widget.amountController.text,
       validator: widget.validator,
       builder: (state) => Column(
         crossAxisAlignment: CrossAxisAlignment.start,