Changed mode selector

[shubham-eaton]

Fixes # .

Changes proposed in this Pull Request:

• Used useColorScheme for checking mode

Screenshots / Screen Recording (if applicable)

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Visit the preview URL for this PR (updated for commit c99786f):

https://blui-react-docs--pr948-feature-blui-upgrade-r95mpezc.web.app

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.96%. Comparing base (ed955b5) to head (c99786f).
Report is 3 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #948   +/-   ##
=======================================
  Coverage   80.96%   80.96%           
=======================================
  Files          47       47           
  Lines        1240     1240           
  Branches      156      156           
=======================================
  Hits         1004     1004           
  Misses        137      137           
  Partials       99       99           

Flag	Coverage Δ
unittests	80.96% <ø> (ø)

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