Correct GL enableExtensionsByDefault check

AUTHORS

@@ -171,4 +171,5 @@ a license to everyone to use it as detailed in LICENSE.)
 * Petr Babicka <babcca@gmail.com>
 * Akira Takahashi <faithandbrave@gmail.com>
 * Victor Costan <costan@gmail.com>
+* Pepijn Van Eeckhoudt <pepijn.vaneeckhoudt@luciad.com> (copyright owned by Luciad NV)
 

src/library_gl.js

@@ -762,7 +762,7 @@ var LibraryGL = {
       // Store the created context object so that we can access the context given a canvas without having to pass the parameters again.
       if (ctx.canvas) ctx.canvas.GLctxObject = context;
       GL.contexts[handle] = context;
-      if (typeof webGLContextAttributes['webGLContextAttributes'] === 'undefined' || webGLContextAttributes.enableExtensionsByDefault) {
+      if (typeof webGLContextAttributes['enableExtensionsByDefault'] === 'undefined' || webGLContextAttributes.enableExtensionsByDefault) {
         GL.initExtensions(context);
       }
       return handle;