reduce false positive for sized_box_for_whitespace

[a14n]

Description

Following my comment on the initial PR there are some cases with behaviour changes. For instance the following change doesn't display the same thing (you can try it in dartpad):

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Column(
        children: [
-          ColoredBox(color: Colors.red, child: Container(height: 80)),
+          ColoredBox(color: Colors.red, child: SizedBox(height: 80)),
          SizedBox(height: 80),
-          ColoredBox(color: Colors.blue, child: Container(height: 80)),
+          ColoredBox(color: Colors.blue, child: SizedBox(height: 80)),
        ],
      ),
    );
  }
}

Basically it works with a child or with both width and height.

[a14n]

/cc @domesticmouse

[domesticmouse]

@a14n thanks for the clarification, much appreciated

[pq]

💎