Fix local flakes when prefixed with "path:" (again)

[tie]

This change fixes regression introduced in commit 4bf5d40. In particular, we should not be passing flake URI without schema to the nix flake archive command.

This fixes use flake path:devel#direnv in .envrc that previously errored at nix flake archive […] "direnv" step (that should have been path:devel).

[Mic92]

@mergify queue

[mergify]

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[Mic92]

@mergify rebase

[mergify]

rebase

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