[NixOS] Don't set trusted users twice

nixos/cachix.nix

@@ -11,6 +11,5 @@
       "taffy.cachix.org-1:H0iiOGeXnLOAptADO4i3AiDIOladTcZYxXp+P0lOvHw="
       "waymonad.cachix.org-1:Z4Nbjc3iYJNFZi0eAgzqLWFBuDRClAy1prZBv7eK64A="
     ];
-    trustedUsers = [ "root" "imalison" "kat" ];
   };
 }

nixos/users.nix

@@ -38,5 +38,5 @@
     };
   };
 
-  nix.trustedUsers = ["imalison" "kat"];
+  nix.trustedUsers = [ "root" "imalison" "kat" ];
 }