fix: add missing box shadow param to the ToastBuilder

[payam-zahedi]

fix: #198

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 74.36%. Comparing base (87cfd2f) to head (711c974).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/src/built_in/layout/standard/style/style.dart	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #217      +/-   ##
==========================================
+ Coverage   74.30%   74.36%   +0.05%     
==========================================
  Files          31       31              
  Lines         899      905       +6     
==========================================
+ Hits          668      673       +5     
- Misses        231      232       +1     

Flag	Coverage Δ
flutter	74.36% <85.71%> (+0.05%)	⬆️

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