fix: avoid double counting of overflow replicas

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (72fa461) 31.44% compared to head (5e8db37) 31.48%.

Files	Patch %	Lines
pkg/controllers/scheduler/framework/util.go	80.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #300 +/- ## ========================================== + Coverage 31.44% 31.48% +0.03% ========================================== Files 122 122 Lines 14346 14351 +5 ========================================== + Hits 4511 4518 +7 + Misses 9421 9419 -2 Partials 414 414 ``` | [Flag](https://app.codecov.io/gh/kubewharf/kubeadmiral/pull/300/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kubewharf) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/kubewharf/kubeadmiral/pull/300/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kubewharf) | `31.48% <83.33%> (+0.03%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=kubewharf#carryforward-flags-in-the-pull-request-comment) to find out more.

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