Fix missing include in test.

unit_tests/graph/Test_Matching.cpp

@@ -17,6 +17,7 @@
 #include "aidge/graph/GraphView.hpp"
 #include "aidge/graph/Testing.hpp"
 #include "aidge/graph/OpArgs.hpp"
+#include "aidge/operator/Add.hpp"
 #include "aidge/operator/ReLU.hpp"
 #include "aidge/operator/MetaOperatorDefs.hpp"
 #include "aidge/operator/Producer.hpp"
@@ -367,7 +368,7 @@ TEST_CASE("[core/graph] Matching") {
             g1->save("graph_single_pass");
 
             auto gm = SinglePassGraphMatching(g1);
-            
+
             const auto start = std::chrono::system_clock::now();
             const auto results = gm.match("Conv->ReLU#;ReLU#->Dummy");
             const auto end = std::chrono::system_clock::now();