Revert "Flake: backport headscale changes to stable nixpkgs"

This reverts commit fdad5d88bb.

flake.nix

@@ -105,9 +105,7 @@
         nixpkgs-patched = nixpkgs-raw.legacyPackages.x86_64-linux.applyPatches {
           name = "patched-nixpkgs";
           src = nixpkgs-raw;
-          patches = [
-            ./nixpkgs-patches/backport_unstable_headscale_changes.patch
-          ];
+          patches = [];
         };
         # https://discourse.nixos.org/t/proper-way-of-applying-patch-to-system-managed-via-flake/21073/26
         nixpkgs-unstable = (import "${nixpkgs-unstable-patched}/flake.nix").outputs {self = inputs.self;};