[Tests] Use non-deprecated TraitsData for MediaCreation test

Part of OpenAssetIO/OpenAssetIO#1311. In #13 we missed an `#include`
that was still using the deprecated location of the `TraitsData` type.

Signed-off-by: David Feltell <[email protected]>

Author: feltech

RELEASE_NOTES.md

@@ -7,7 +7,7 @@ v1.0.0-alpha.x
 ### Breaking Changes
 
 * Update to use non-deprecated `TraitsData` path/namespace.
-  [#13](https://github.com/OpenAssetIO/OpenAssetIO-Test-CMake/pull/13)
+  [OpenAssetIO#1311](https://github.com/OpenAssetIO/OpenAssetIO/issues/1311)
 
 ### New Features
 

src/test.mediacreation.cpp

@@ -3,13 +3,13 @@
 
 // Include all headers to test they are where we expect and can be
 // compiled.
-#include <openassetio/TraitsData.hpp>
+#include <openassetio/trait/TraitsData.hpp>
 
 #include <openassetio_mediacreation/openassetio_mediacreation.hpp>
 
 int main() {
   auto trait = openassetio_mediacreation::traits::managementPolicy::ManagedTrait(
-      openassetio::TraitsData::make());
+      openassetio::trait::TraitsData::make());
 
   trait.imbue();
   return 0;