Minor fix oldImagesBackCompat
Handle old texture names on server-side as well. Fixes #92

- After 475fc48360bc2199c237b4aadece1b90c3c3ec1f, texture values have been
  reduced from filename to a simpler type name. Back compat was being handled at
  client-side. But, it needs to be handled on server-side as well;
1.10.0-16