WASM bindings: add missing smooth function to the ManifoldStatic interface

[jirihon]

Add missing smooth function to the ManifoldStatic interface.

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[codecov-commenter]

Codecov Report

Base: 92.13% // Head: 92.13% // No change to project coverage 👍

Coverage data is based on head (3e56d61) compared to base (c59130c).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #267   +/-   ##
=======================================
  Coverage   92.13%   92.13%           
=======================================
  Files          32       32           
  Lines        3421     3421           
=======================================
  Hits         3152     3152           
  Misses        269      269           

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[elalish]

Thanks!