Update sway config and flake.nix

overlays/default.nix

@@ -0,0 +1,3 @@
+{
+    gamescope = import ./gamescope-last-working.nix;
+}

overlays/gamescope-last-working.nix

@@ -0,0 +1,11 @@
+final: prev: {
+    gamescope = prev.gamescope.overrideAttrs ( old: {
+        src = prev.fetchFromGitHub {
+            owner = "ValveSoftware";
+            repo = "gamescope";
+            rev = "d0d23c4c3010c81add1bd90cbe478ce4a386e28d";
+            fetchSubmodules = true;
+            hash = "sha256-Ym1kl9naAm1MGlxCk32ssvfiOlstHiZPy7Ga8EZegus=";
+        };
+    });
+}