[FIX] sdk normalization to_rgb option not working

[SineYuan]

Thanks for your contribution and we appreciate it a lot. The following instructions would make your pull request more healthy and more easily receiving feedbacks. If you do not understand some items, don't worry, just make the pull request and seek help from maintainers.

Motivation

fix problem on mmdeploy sdk normalization operation option to_rgb not working while to_float option set to false.

Modification

csrc/mmdeploy/preprocess/transform/normalize.cpp

BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

1. Pre-commit or other linting tools are used to fix the potential lint issues.
2. The modification is covered by complete unit tests. If not, please add more unit tests to ensure the correctness.
3. If the modification has a dependency on downstream projects of a newer version, this PR should be tested with all supported versions of downstream projects.
4. The documentation has been modified accordingly, like docstring or example tutorials.

[CLAassistant]

All committers have signed the CLA.

[AllentDan]

LGTM

[AllentDan]

Hi, @SineYuan please sign the CLA.

[codecov]

Codecov Report

Base: 44.34% // Head: 44.34% // No change to project coverage 👍

Coverage data is based on head (f95e7e9) compared to base (02d5a09).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1771   +/-   ##
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  Coverage   44.34%   44.34%           
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  Files         356      356           
  Lines       12773    12773           
  Branches     1813     1813           
=======================================
  Hits         5664     5664           
  Misses       6714     6714           
  Partials      395      395           

Flag	Coverage Δ
unittests	44.34% <ø> (ø)

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[SineYuan]

Hi, @SineYuan please sign the CLA.

ok, signed

[openmmlab-bot]

SineYuan，您好！您在MMXXX项目中给我们提的PR非常重要，感谢您付出私人时间帮助改进开源项目，相信很多开发者会从你的PR中受益。
我们非常期待与您继续合作，OpenMMLab专门成立了贡献者组织MMSIG，为贡献者们提供开源证书、荣誉体系和专享好礼，可通过添加微信：openmmlabwx 联系我们（请备注mmsig+GitHub id），由衷希望您能加入！
Dear SineYuan,
First of all, we want to express our gratitude for your significant PR in the MMXXX project. Your contribution is highly appreciated, and we are grateful for your efforts in helping improve this open-source project during your personal time. We believe that many developers will benefit from your PR.
We are looking forward to continuing our collaboration with you. OpenMMLab has established a special contributors' organization called MMSIG, which provides contributors with open-source certificates, a recognition system, and exclusive rewards. You can contact us by adding our WeChat（if you have WeChat): openmmlab_wx, or join in our discord： https://discord.gg/qH9fysxPDW. We sincerely hope you will join us!
Best regards！ @SineYuan