Update macOS icon to match new Big Sur style

app/main.cpp

@@ -462,7 +462,11 @@ int main(int argc, char *argv[])
     }
 #endif
 
+#ifndef Q_OS_DARWIN
+    // Set the window icon except on macOS where we want to keep the
+    // modified macOS 11 style rounded corner icon.
     app.setWindowIcon(QIcon(":/res/moonlight.svg"));
+#endif
 
     // Register our C++ types for QML
     qmlRegisterType<ComputerModel>("ComputerModel", 1, 0, "ComputerModel");