fix: configs property for --devtool

[snitin315]

What kind of change does this PR introduce?
bugfix

Did you add tests for your changes?
Yes
If relevant, did you update the documentation?
No
Summary

devtool can also accept false.

Does this PR introduce a breaking change?
No

Other information
None

[alexander-akait]

Only for webpack v5, we already support it

[snitin315]

I see then we should remove negative: true?

[snitin315]

It is allowed for v4 too https://github.com/webpack/webpack/blob/webpack-4/schemas/WebpackOptions.json#L2039

[alexander-akait]

yep, okay, let's do it, but I don't want to accept any bugfixes/features (expect security bugs for v4), because when we will drop webpack v4 we will remove these flags

[snitin315]

Makes sense 👍🏻

[codecov]

Codecov Report

Merging #2603 (0a8ef27) into master (3a5cf10) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2603   +/-   ##
=======================================
  Coverage   91.35%   91.35%           
=======================================
  Files          29       29           
  Lines        1480     1480           
  Branches      425      425           
=======================================
  Hits         1352     1352           
  Misses        128      128           

Impacted Files	Coverage Δ
packages/webpack-cli/lib/webpack-cli.js	92.41% <ø> (ø)

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[snitin315]

/cc @webpack/cli-team

[alexander-akait]

Thanks