Adapt configuration group names to Yii conventions

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	✔️
Fixed issues	https://github.com/yiisoft/app/issues/271

[codecov[bot]]

Codecov Report

Base: 95.80% // Head: 95.80% // No change to project coverage :thumbsup:

Coverage data is based on head (41d773d) compared to base (5448f53). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #552 +/- ## ========================================= Coverage 95.80% 95.80% Complexity 690 690 ========================================= Files 85 85 Lines 2124 2124 ========================================= Hits 2035 2035 Misses 89 89 ``` | [Impacted Files](https://codecov.io/gh/yiisoft/validator/pull/552?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=yiisoft) | Coverage Δ | | |---|---|---| | [config/di.php](https://codecov.io/gh/yiisoft/validator/pull/552?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=yiisoft#diff-Y29uZmlnL2RpLnBocA==) | `100.00% <ø> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=yiisoft). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=yiisoft)

:umbrella: View full report at Codecov.
:loudspeaker: Do you have feedback about the report comment? Let us know in this issue.