fix(wigglydonke.rs): Don't rebuild nginx config unnecessarily

This fix is essentially the same as the one in cl/1263.

Change-Id: I27be280a610914fcfbb6d7fee7aebaa56b993812
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3158
Reviewed-by: sterni <sternenseemann@systemli.org>
Reviewed-by: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI

ops/modules/www/wigglydonke.rs.nix

@@ -9,7 +9,7 @@
     services.nginx.virtualHosts."wigglydonke.rs" = {
       enableACME = true;
       forceSSL = true;
-      root = "${depot.path}/users/grfn/wigglydonke.rs";
+      root = "${depot.path + "/users/grfn/wigglydonke.rs"}";
     };
   };
 }