nixos/incus: fix incus containers being wrongly restarted on package update whilst softDaemonRestart is set

When softDaemonRestart is enabled, containers and virtual machines still get restarted when incus updates
Disabling stopIfChanged on both incus-startup and incus fixes this

nixos/modules/virtualisation/incus.nix

@@ -446,6 +446,8 @@ in
       ]
       ++ lib.optionals (cfg.useACMEHost != null) [ "acme-${cfg.useACMEHost}.service" ];
 
+      stopIfChanged = lib.mkIf cfg.softDaemonRestart false;
+
       serviceConfig = {
         ExecStart = "${cfg.package}/bin/incusd --group incus-admin";
         ExecStartPost = "${cfg.package}/bin/incusd waitready --timeout=${cfg.startTimeout}";
@@ -504,6 +506,7 @@ in
 
       # restarting this service will affect instances
       restartIfChanged = false;
+      stopIfChanged = false;
 
       serviceConfig = {
         ExecStart = "${incus-startup} start";