fix on NCButton size

lib/components/nc_button.dart

@@ -8,15 +8,15 @@ class NcButton extends StatelessWidget {
     required this.backgroundColor,
     required this.captionColor,
     this.onPressed,
-    required this.width,
-    required this.height,
+    this.width,
+    this.height,
   });
 
   final String caption;
   final Color backgroundColor;
   final Color captionColor;
-  final double width;
-  final double height;
+  final double? width;
+  final double? height;
   final void Function()? onPressed;
 
   @override