Potential fix for code scanning alert no. 5403: Commented-out code

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: bigfooted

Common/src/grid_movement/CSurfaceMovement.cpp

@@ -4920,7 +4920,6 @@ void CSurfaceMovement::WriteFFDInfo(CSurfaceMovement** surface_movement, CGeomet
     auto str = config[ZONE_0]->GetMesh_Out_FileName();
     unsigned short lastindex = str.find_last_of('.');
     str = str.substr(0, lastindex) + ".su2";
-    // str = ".su2";
 
     output_file.precision(15);
     output_file.open(str, ios::out | ios::app);