fix: strategy/pivotshort: fix margin quantity calculation

[c9s]

No description provided.

[bbgokarma-bot]

Welcome back! @c9s, This pull request may get 281 BBG.

[codecov]

Codecov Report

Merging #833 (763ae1f) into main (0a08cc2) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #833      +/-   ##
==========================================
- Coverage   19.81%   19.78%   -0.04%     
==========================================
  Files         365      365              
  Lines       27801    27846      +45     
==========================================
  Hits         5508     5508              
- Misses      21767    21812      +45     
  Partials      526      526              

Impacted Files	Coverage Δ
pkg/bbgo/session.go	7.81% <0.00%> (-0.21%)	⬇️
pkg/bbgo/trader.go	0.00% <0.00%> (ø)
pkg/strategy/pivotshort/breaklow.go	0.00% <0.00%> (ø)

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[bbgokarma-bot]

Hi @c9s,

Well done! 291 BBG has been sent to your polygon wallet. Please check the following tx:

https://polygonscan.com/tx/0x4c195d10f16650447d4d662ee54d4bf2914d7cadb0deb3a502c39b04c9a23561

Thank you for your contribution!