Remove "DataFlow2" section from identical-files.json

Author: hvitved

scripts/identical-files.json

@@ -12,10 +12,6 @@
         "ql/lib/codeql/ruby/dataflow/internal/DataFlowImpl.qll",
         "ql/lib/codeql/ruby/dataflow/internal/DataFlowImpl2.qll"
     ],
-    "DataFlow2": [
-        "codeql/csharp/ql/lib/semmle/code/csharp/dataflow/internal/DataFlowImpl2.qll",
-        "ql/lib/codeql/ruby/dataflow/internal/DataFlowImpl2.qll"
-    ],
     "DataFlow Consistency": [
         "codeql/csharp/ql/lib/semmle/code/csharp/dataflow/internal/DataFlowImplConsistency.qll",
         "ql/lib/codeql/ruby/dataflow/internal/DataFlowImplConsistency.qll"