JS: Remove stray module DF export

Author: asgerf

javascript/ql/lib/semmle/javascript/frameworks/data/internal/ApiGraphModelsSpecific.qll

@@ -27,8 +27,6 @@ class Unit = JS::Unit;
 // Re-export libraries needed by ApiGraphModels.qll
 module API = JS::API;
 
-module DF = DataFlow;
-
 import semmle.javascript.frameworks.data.internal.AccessPathSyntax as AccessPathSyntax
 import JS::DataFlow as DataFlow
 private import AccessPathSyntax