Accidental symbols (+) out of place

Notice there is a recent similar fix: 154545fccf0fbebbd4f83fa1b9a3c04c2888b8f9

src/Main/MainGui.cpp

@@ -157,8 +157,8 @@ int main(int argc, char** argv)
         argv_.push_back(0);  // 0-terminated string
     }
 
-    +  // https://www.qt.io/blog/dark-mode-on-windows-11-with-qt-6.5
-        +_putenv("QT_QPA_PLATFORM=windows:darkmode=1");
+    // https://www.qt.io/blog/dark-mode-on-windows-11-with-qt-6.5
+    _putenv("QT_QPA_PLATFORM=windows:darkmode=1");
 #endif
 
     // Name and Version of the Application