Removed label parameter from auto_correct_color function

[Sam-Taylor-UIOWA]

Describe your changes
I removed all instances and uses of the label parameter within auto_correct_color.py

Type of update
Is this a:

• Update to documentation

For the reviewer
See this page for instructions on how to review the pull request.

• PR functionality reviewed in a Jupyter Notebook
• All tests pass
• Test coverage remains 100%
• Documentation tested
• New documentation pages added to plantcv/mkdocs.yml
• Changes to function input/output signatures added to updating.md
• Code reviewed
• PR approved

[deepsource-io]

Here's the code health analysis summary for commits 9367180..9136141. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Python	✅ Success		View Check ↗
Test coverage	✅ Success		View Check ↗

Code Coverage Report

Metric	Aggregate	Python
Branch Coverage	100%	100%
Composite Coverage	100%	100%
Line Coverage	100%	100%
New Branch Coverage	100%	100%
New Composite Coverage	100%	100%
New Line Coverage	100%, ✅ Above Threshold	100%, ✅ Above Threshold

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[nfahlgren]

@all-contributors please add @Sam-Taylor-UIOWA for code, doc

[allcontributors]

@nfahlgren

I've put up a pull request to add @Sam-Taylor-UIOWA! 🎉