Do not use spaces in the name of the official AppImage distribution

[ChiefArug]

When I downloaded the AppImage from https://modrinth.com/app the filename was Modrinth App_0.9.3_amd64.AppImage, with a space between Modrinth and App. This is slightly annoying to deal with when working from the terminal (not impossible, just annoying), removing the space between Modrinth and App would just make it easier for people who like to use the terminal for operations (who are a lot more common on linux).