solver3: Fix intransitivity of version comparison on upgrade

We only compared candidate to installed version, but candidate
should dominate all versions, otherwise we end up in the fancy
problem of elpa-notmuch in
  upgrade-noble-t64-remove-desktop-2024-03-29.edsp

Where we had three versions:

    not-installable 0.38.3-1ubuntu1
    candidate 0.38.2-1.1ubuntu2
    installed 0.38.2-1ubuntu2

And received an ordering:

    installed > non-installable > candidate

despite

    candidate > installed

This is only visible with no-strict-pinning right now, as we are
otherwise filtering out invalid choices (and hence we only have
candidate and installed otherwise).

0 files changed, 0 insertions, 0 deletions