[ConstPlugin] fix bug introduced by evaluation of && and ||

[ljqx]

This PR closes #8269. When code is like

return'development'===process.env.NODE_ENV&&'foo'

It's valid but now it would be translated to

returnfalse&&'foo'

This fix changes it to

return false&&'foo'

What kind of change does this PR introduce?
bugfix

Did you add tests for your changes?
yes

Does this PR introduce a breaking change?
no

What needs to be documented once your changes are merged?
no as it's bugfix

[webpack-bot]

For maintainers only:

• This need to be documented (issue in webpack/webpack.js.org will be filed when merged)

[webpack-bot]

Thank you for your pull request! The most important CI builds succeeded, we’ll review the pull request soon.

[sokra]

Thanks