Update field name of serialized format not to make problem with js

Signed-off-by: Jung Tae-young <naey05@gmail.com>
Change-Id: I69ee32b5e201198610e7ba6ec22b0c0025a7e57c
diff --git a/src/armnnDeserializer/test/DeserializeActivation.cpp b/src/armnnDeserializer/test/DeserializeActivation.cpp
index ad03dd6..9e98893 100644
--- a/src/armnnDeserializer/test/DeserializeActivation.cpp
+++ b/src/armnnDeserializer/test/DeserializeActivation.cpp
@@ -71,7 +71,7 @@
                     descriptor: {
                         a: )" + a + R"(,
                         b: )" + b + R"(,
-                        function: )" + activationType + R"(
+                        activationFunction: )" + activationType + R"(
                     },
                 },
             },