Update country_code_picker.dart

lib/country_code_picker.dart

@@ -23,6 +23,7 @@ class CountryCodePicker extends StatefulWidget {
   final Function(CountryCode) builder;
   final bool enabled;
   final TextOverflow textOverflow;
+  final Icon closeIcon;
 
   /// the size of the selection dialog
   final Size dialogSize;
@@ -84,6 +85,7 @@ class CountryCodePicker extends StatefulWidget {
     this.countryFilter,
     this.hideSearch = false,
     this.dialogSize,
+    this.closeIcon = Icon(Icons.close),
     Key key,
   }) : super(key: key);
 
@@ -245,6 +247,7 @@ class CountryCodePickerState extends State<CountryCodePicker> {
         flagWidth: widget.flagWidth,
         size: widget.dialogSize,
         hideSearch: widget.hideSearch,
+        closeIcon: widget.closeIcon,
       ),
     ).then((e) {
       if (e != null) {