Updated KHR_materials_iridescence camelCase convention

[donmccurdy]

• See Adding the KHR_materials_iridescence effect KhronosGroup/glTF#2027 (comment)

[codecov-commenter]

Codecov Report

Merging #570 (fa54355) into main (0bae984) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #570   +/-   ##
=======================================
  Coverage   83.42%   83.42%           
=======================================
  Files         114      114           
  Lines        3843     3843           
  Branches      957      957           
=======================================
  Hits         3206     3206           
  Misses        306      306           
  Partials      331      331           

Impacted Files	Coverage Δ
...khr-materials-iridescence/materials-iridescence.ts	79.48% <100.00%> (ø)

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