message: [tfdbg2] Fix a copy-paste error in unit test code
  Fixes
diff: @@ -1128,7 +1128,7 @@ class TracingCallbackTest(
  # 1st element: tensor ID; 2nd element: 0 indicating no inf or nan.
  self.assertAllClose(trace.debug_tensor_value, [tensor_id, 0])
  elif tensor_debug_mode == "CONCISE_HEALTH":
  - for tensor_value in tensor_values:
  + for trace in graph_exec_traces:
  tensor_id = reader.graph_execution_trace_to_tensor_id(trace)
  # 1st element: tensor ID.
  # 2nd element: element count. Remaining elements: all zero because there
  