Geometry toJSON fix

[gelibolue]

Same problem, correct fix #10468
Current geometry.toJSON creates output like this:

{
  "uuid":"E1A66209-4A78-4B74-A760-BFF01BC3FA3E",
  "type":"Geometry",
  "data":
  {
    "vertices":[0,0,0,1,0,0,1,1,0,0,1,0],
    "normals":[],
    "faces":[2,0,1,2,0,2,0,2,3,0]
  }
}

Should be like this (clara.io and blender exporter use this one):

{
  "uuid":"E1A66209-4A78-4B74-A760-BFF01BC3FA3E",
  "type":"Geometry",
  "vertices":[0,0,0,1,0,0,1,1,0,0,1,0],
  "normals":[],
  "faces":[2,0,1,2,0,2,0,2,3,0]
}

[mrdoob]

Thanks!