stats are not colored in v4 when config returns multiple objects

[mihkeleidast]

Describe the bug

When a webpack config returns multiple configurations as an array, the output stats are not colored.

// webpack.config.js
module.exports = [{
    entry: './src/index.js',
},
{
    entry: './src/index.js',
}];

Expected behavior

Stats should be colored when there are more than one configurations returned by the config file.

Screenshots

4.2.0, multiple configurations (example above):

4.2.0, single config (file can return an array with a single object):

3.3.12, same config as above:

Additional context

Webpack 4.44.2.

[alexander-akait]

Duplicate #2038, title can be misleading, but the problem in one place