changed white balance print to plot

[sdkenney42]

Describe your changes
Changed print to plot in white balance

Type of update
Is this a:

• Update to documentation

Associated issues
#999

Additional context
Add any other context about the problem here.

For the reviewer
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• 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

[codecov]

Codecov Report

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The diff coverage is n/a.

❗ Current head 9801023 differs from pull request most recent head 3123dd2. Consider uploading reports for the commit 3123dd2 to get more accurate results

@@           Coverage Diff           @@
##             main    #1034   +/-   ##
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  Coverage        ?   99.98%           
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  Files           ?      141           
  Lines           ?     6004           
  Branches        ?        0           
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  Hits            ?     6003           
  Misses          ?        1           
  Partials        ?        0           

Flag	Coverage Δ
unittests	99.98% <ø> (?)

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