message: Update generator search path in JavaScript
  This changelist updates the generator search path used in MaterialX JavaScript, aligning it with other generators in the MaterialX codebase.
diff: @@ -19,13 +19,12 @@ namespace ems = emscripten;
  namespace mx = MaterialX;
  /// Initialize the given generation context
  -void initContext(mx::GenContext& context, mx::FileSearchPath searchPath, mx::DocumentPtr stdLib, mx::UnitConverterRegistryPtr unitRegistry) {
  - // Initialize search paths.
  - for (const mx::FilePath& path : searchPath)
  +void initContext(mx::GenContext& context, mx::FileSearchPath searchPath, mx::DocumentPtr stdLib, mx::UnitConverterRegistryPtr unitRegistry)
  {
  - context.registerSourceCodeSearchPath(path / "libraries");
  - }
  + // Register the search path for shader source code.
  + context.registerSourceCodeSearchPath(searchPath);
  + // Set shader generation options.
  context.getOptions().targetColorSpaceOverride = "lin_rec709";
  context.getOptions().fileTextureVerticalFlip = false;
  context.getOptions().hwMaxActiveLightSources = 1;
  