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/ProtoxtFixture.cpp b/src/armnnOnnxParser/test/ProtoxtFixture.cpp
index a02102f..917f6f0 100644
--- a/src/armnnOnnxParser/test/ProtoxtFixture.cpp
+++ b/src/armnnOnnxParser/test/ProtoxtFixture.cpp
@@ -31,7 +31,7 @@
                           name:  "Input"
                           type {
                             tensor_type {
-                              elem_type: FLOAT
+                              elem_type: 1
                               shape {
                                 dim {
                                   dim_value: 2
@@ -44,7 +44,7 @@
                           name:  "Output"
                           type {
                              tensor_type {
-                               elem_type: FLOAT
+                               elem_type: 1
                                shape {
                                  dim {
                                     dim_value: 1