Fix local deployment with SSH options without sudo

Due to a typo, SSH options would be ignored for `rebuild` when using
`lollypops.deployment.local-evaluation = true`,
`lollypops.deployment.sudo.enable = false`, and
`lollypops.deployment.ssh.opts`.
Since SSH options can be overriden at runtime, and having an empty
NIX_SSHOPTS doesn't seem to be an issue, I removed the Nix-time switch
altogether.

flake.nix

@@ -181,7 +181,7 @@
                             cmds = [
                               (if hostConfig.config.lollypops.deployment.local-evaluation then
                                 ''
-                                  ${optionalString useSudo ''NIX_SSHOPTS="{{.REMOTE_SSH_OPTS}}"''} nixos-rebuild {{.REBUILD_ACTION}} \
+                                  NIX_SSHOPTS="{{.REMOTE_SSH_OPTS}}" nixos-rebuild {{.REBUILD_ACTION}} \
                                     --flake '{{.LOCAL_FLAKE_SOURCE}}#{{.HOSTNAME}}' \
                                     --target-host {{.REMOTE_USER}}@{{.REMOTE_HOST}} \
                                     ${optionalString useSudo "--use-remote-sudo"}