refactor(fruitbook): use sddm module

hosts/fruitbook/configuration.nix

@@ -13,6 +13,7 @@
     niri.enable = true;
     steam.enable = true;
     bluetooth.enable = true;
+    sddm.enable = true;
     users.users = [
       "crumb"
       "msyds"
@@ -38,12 +39,6 @@
     };
   };
 
-  services.displayManager.sddm = {
-    enable = true;
-    wayland.enable = true;
-    autoNumlock = true;
-  };
-
   services.libinput = {
     enable = true;
     # Disable mouse acceleration.