Forgot to re-transpose the matrix for validation

Signed-off-by: Thien Nguyen <nguyentm@ornl.gov>

quantum/plugins/optimizers/gate_merge/GateMergeOptimizer.cpp

@@ -261,6 +261,7 @@ void MergeTwoQubitBlockOptimizer::apply(std::shared_ptr<CompositeInstruction> pr
             
             // Optimized decomposed sequence:
             const auto nbInstructionsAfter = kak->nInstructions();
+            uMat.transposeInPlace();
             // A simplified sequence was found.
             if (nbInstructionsAfter < sequence.size() && compareMatIgnoreGlobalPhase(uMat, calcUopt(kak)))
             {