fix: css experiments logic

[alexander-akait]

This PR contains a:

• [x] bugfix
• [ ] new feature
• [ ] code refactor
• [x] test update
• [ ] typo fix
• [ ] metadata update

Motivation / Use-Case

Fix logic

Breaking Changes

No

Additional Info

We will need to update snapshots after release css-loader

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (14e731e) 89.96% compared to head (c12e70b) 90.14%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #617 +/- ## ========================================== + Coverage 89.96% 90.14% +0.17% ========================================== Files 15 15 Lines 329 335 +6 Branches 170 176 +6 ========================================== + Hits 296 302 +6 Misses 27 27 Partials 6 6 ```

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