(fix) Fix tip amount scaling in fulfillOrders

[frankisawesome]

Motivation

Fixes #558

Solution

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 99.16667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 98.41%. Comparing base (f618d19) to head (74cdd01).
Report is 62 commits behind head on main.

Files	Patch %	Lines
src/seaport.ts	97.05%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #559      +/-   ##
==========================================
+ Coverage   98.27%   98.41%   +0.13%     
==========================================
  Files          35       35              
  Lines       14526    14955     +429     
  Branches      660      671      +11     
==========================================
+ Hits        14276    14718     +442     
+ Misses        245      232      -13     
  Partials        5        5              

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