host: Fix issue when wifi.nix is not imported

modules/host.nix

@@ -165,9 +165,9 @@ let
       bluetooth = lib.mkIf wireless {
         enable = true;
       };
-
-      wifiInterface = lib.mkIf wireless wifiInterface;
-    };
+    } // (if wireless then {
+      wifiInterface = wifiInterface;
+    } else {});
     
     boot = {
       loader =  {