Add missing namespace in Scaling.cpp

src/operator/Scaling.cpp

@@ -20,7 +20,7 @@
 
 const std::string Aidge::Scaling_Op::Type = "Scaling";
 
-void Aidge::Scaling_Op::setBackend(const std::string& name, DeviceIdx_t device) {
+void Aidge::Scaling_Op::setBackend(const std::string& name, Aidge::DeviceIdx_t device) {
     SET_IMPL_MACRO(Scaling_Op, *this, name);
     mOutputs[0]->setBackend(name, device);
 }
\ No newline at end of file