fixed skip button in verify user dialog to be more visible in dark mode

Author: ekjotmultani

packages/authenticator/amplify_authenticator/lib/src/widgets/button.dart

@@ -583,9 +583,8 @@ class SkipVerifyUserButton extends StatelessAuthenticatorComponent {
       onPressed: state.skipVerifyUser,
       child: Text(
         stringResolver.buttons.skip(context),
-        style: TextStyle(
+        style: const TextStyle(
           fontSize: AuthenticatorButtonConstants.fontSize,
-          color: Theme.of(context).primaryColor,
         ),
       ),
     );