MainWindow: Fix use-after-free during shutdown

Remove ConfigChangedCallback in MainWindow's destructor to prevent the
callback from accessing the destroyed MainWindow afterward.

After MainWindow is destroyed UICommon::Shutdown calls
LogManager::Shutdown which ultimately triggers any remaining callbacks.
This resulted in calling MainWindow::OnHardcoreChanged, which crashed in
debug builds and didn't have any obvious effect in release builds.

0 files changed, 0 insertions, 0 deletions