nixos/tests/wordpress: fix test

- explicitly add dbHost to fix test
- remove unnecessary options that are set by default anyway

nixos/tests/wordpress.nix

···
             enable = true;
             logPerVirtualHost = true;
             adminAddr="[e-mail]";
-            extraModules = [
-              { name = "php7"; path = "${pkgs.php}/modules/libphp7.so"; }
-            ];
 
             virtualHosts = [
               {
···
                     {
                       serviceType = "wordpress";
                       dbPassword = "wordpress";
-                      wordpressUploads = "/data/uploads";
+                      dbHost = "127.0.0.1";
                       languages = [ "de_DE" "en_GB" ];
                     }
                   ];