Fix the ONNX parser tests issues due to a change in the latest ONNx master

 * A recent change in ONNX now forces the data types to be indicated by the
   integer corresponding to their original enum value
 * The new values are taken from the TensorProto_DataType enum at onnx.pb.h:153

Change-Id: I6054611795a7edb11463396eaefc4dd7e27261a0
diff --git a/src/armnnOnnxParser/test/CreateNetwork.cpp b/src/armnnOnnxParser/test/CreateNetwork.cpp
index 37b62e4..1e3e1b4 100644
--- a/src/armnnOnnxParser/test/CreateNetwork.cpp
+++ b/src/armnnOnnxParser/test/CreateNetwork.cpp
@@ -23,7 +23,7 @@
                                  name:  "Output"
                                  type {
                                     tensor_type {
-                                      elem_type: FLOAT
+                                      elem_type: 1
                                       shape {
                                         dim {
                                            dim_value: 1