Make sure 'slim' model is correctly checked

The 'textures.SKIN.metadata.model' field seems to be only present if set to 'slim', so currently this change has no effect
however, if the field is returned in other cases (in future), we need to make sure it acually reports 'slim'

lib/networking.js

@@ -135,7 +135,7 @@ exp.get_uuid_info = function(profile, type, callback) {
   var url = Object.get(profile, "textures." + type + ".url");
   var slim;
   if (type === "SKIN") {
-    slim = Object.get(profile, "textures.SKIN.metadata.model");
+    slim = Object.get(profile, "textures.SKIN.metadata.model") === "slim";
   }
 
   callback(url || null, !!slim);