feat: 5905 - toggle instead of check box for "discount" price

[monsieurtanuki]

What

• Toggle instead of check box for "discount" price

Screenshots

Fixes bug(s)

• Closes: Turn the checkbox into a toggle #5905

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 6.57%. Comparing base (4d9c7fc) to head (4b4065a).
Report is 517 commits behind head on develop.

Files with missing lines	Patch %	Lines
...smooth_app/lib/pages/prices/price_amount_card.dart	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5930      +/-   ##
==========================================
- Coverage     9.54%   6.57%   -2.97%     
==========================================
  Files          325     437     +112     
  Lines        16411   24666    +8255     
==========================================
+ Hits          1567    1623      +56     
- Misses       14844   23043    +8199     

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[teolemon]

Great, thanks @monsieurtanuki