JS: Remove code duplication library

javascript/ql/src/external/DuplicateFunction.ql

@@ -16,15 +16,10 @@
  */
 
 import javascript
-import CodeDuplication
 import semmle.javascript.RestrictedLocations
 
 from Function f, Function g, float percent
-where
-  duplicateContainers(f, g, percent) and
-  f.getNumBodyStmt() > 5 and
-  not duplicateContainers(f.getEnclosingStmt().getContainer(), g.getEnclosingStmt().getContainer(),
-    _)
+where none()
 select f.(FirstLineOf),
   percent.floor() + "% of statements in " + f.describe() + " are duplicated in $@.",
   g.(FirstLineOf), g.describe()