Python: Remove solved consistency work-around

This has not been needed for some time now, but hadn't been removed
before now.

python/ql/test/experimental/dataflow/TestUtil/DataFlowConsistency.qll

@@ -20,15 +20,6 @@ private class MyConsistencyConfiguration extends ConsistencyConfiguration {
     n instanceof SynthDictSplatParameterNode
   }
 
-  override predicate uniqueParameterNodeAtPositionExclude(
-    DataFlowCallable c, ParameterPosition pos, Node p
-  ) {
-    // TODO: This can be removed once we solve the overlap of dictionary splat parameters
-    c.getParameter(pos) = p and
-    pos.isDictSplat() and
-    not exists(p.getLocation().getFile().getRelativePath())
-  }
-
   override predicate uniqueParameterNodePositionExclude(
     DataFlowCallable c, ParameterPosition pos, Node p
   ) {