Restart deluged on failure in tests

Running

```sh
nix build .#checks.x86_64-linux.vm_deluge_sso --max-jobs 1 --cores 1
```

`deluged` sometimes segfaults: https://gist.github.com/dniku/5056689d9191e839e39d4c7b3fbf6410

Fixing this does not seem in scope for SHB.

test/services/deluge.nix

@@ -108,6 +108,11 @@ let
         request = config.shb.deluge.localclientPassword.request;
         settings.content = "localpw";
       };
+
+      systemd.services.deluged.serviceConfig = {
+        Restart = lib.mkForce "on-failure";
+        RestartSec = "1s";
+      };
     };
 
   clientLogin =