C#: Update pretty printing to align with latest change to the shared library.

Author: michaelnebel

csharp/test/TestUtilities/PrettyPrintModels.ql

@@ -5,7 +5,3 @@
 import semmle.code.csharp.dataflow.internal.ExternalFlow
 import codeql.dataflow.test.ProvenancePathGraph
 import codeql.dataflow.test.ProvenancePathGraph::TestPostProcessing::TranslateProvenanceResults<interpretModelForTest/2>
-
-from string relation, int row, int column, string data
-where results(relation, row, column, data)
-select relation, row, column, data