The logic used to figure out the correct Unix socket path for access to
 the demon in `client.ConnectIncusUnix()` was fixed in in
 d8b78d50 to account for use of
 /run/incus/unix.socket as an alternative socket location. However, the
 proxying code of incus-user was not updated when the fix was
 introduced. As a result, even if initial connection to the server and
 the configuration queries were successful, the actual attempt to proxy
 a client request would fail while trying to connect to
 /var/lib/incus/unix.socket regardless of prior findings.

Signed-off-by: Maciek Borzecki <maciek.borzecki@gmail.com>