move where-is-my-sddm-theme to the graphics module

os/common-graphics.nix

@@ -25,6 +25,10 @@
     };
   };
 
+  environment.systemPackages = with pkgs; [
+    where-is-my-sddm-theme
+  ];
+
   services.printing.enable = true;
 
   boot.plymouth = {

os/common.nix

@@ -40,7 +40,6 @@
   environment.systemPackages = with pkgs; [
     nh
     neovim
-    where-is-my-sddm-theme
   ];
 
   security.rtkit.enable = true;