virtmanager{,-qt}: rename to `virt-manager{,-qt}`

Both the executable and the derivation's pname are named `virt-manager`,
however the attribute name is named `virtmanager` which is pretty
confusing when e.g. using this package with `nix run`.

Thus I renamed the package accordingly and added aliases for
backwards-compatibility (both attributes aren't used somewhere else
in nixpkgs, so the rename should be fine).

Also several other distros use `virt-manager` as package name like
Arch[1], Debian[2] or Fedora[3].

[1] https://www.archlinux.org/packages/community/any/virt-manager/
[2] https://packages.debian.org/buster/virt-manager
[3] https://apps.fedoraproject.org/packages/virt-manager

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