hainich/nginx: let all empty subdomains 404

* make hainich.hacc.space the default virtualHost for nginx
if no host is running on that subdomain, this will be shown
* disable SSL, so no pesky SSL error for empty subdomains anymore
* remove lots of unneeded brackes and semicolons

hosts/hainich/services/nginx.nix

@@ -12,14 +12,10 @@
 
   services.nginx.virtualHosts = let
   in {
+    # let all empty subdomains pointing to hainich return 404
     "hainich.hacc.space" = {
-      enableACME = true;
-      forceSSL = true;
-      locations = {
-        "/" = {
-          return = "404";
-        };
-      };
+      default = true;
+      locations."/".return = "404";
     };
   };