Treat changes to installers that were never published before as new installers, not submissions

[tannisroot]

People love to submit new installers instead of changing existing ones for no reason, which they then edit, making them end up in the submissions list instead of staying in the "New Installers" section. That should not happen, instead, the edit to the new installer should replace the previous "new installer" submission and stay in the "New Installers" section.