feat: rewrite to more nixy flakes

pkgs/tetrio/skins/simple-connected.nix

@@ -1,21 +1,18 @@
-{
-    pkgs ? import <nixpkgs> { },
-    ...
-}:
+{ stdenv, fetchurl, ... }:
 
 let
-    src = pkgs.fetchurl {
+    src = fetchurl {
         url = "https://you.have.fail/tetrioplus/data/tpsefiles/skin/SpooKoArts/simple_connected.zip.tpse";
         hash = "sha256-dIrEpEV9Gy2iU6K6rMrNX4XFQEchkJqSmOuQwVF4EQQ=";
     };
 in
-pkgs.stdenv.mkDerivation {
+stdenv.mkDerivation {
     name = "simple-connected";
     version = "2022-06-26";
     inherit src;
 
-	dontUnpack = true;
-	dontBuild = true;
+    dontUnpack = true;
+    dontBuild = true;
 
     installPhase = ''
         		runHook preInstall
@@ -23,9 +20,9 @@ pkgs.stdenv.mkDerivation {
         		runHook postInstall
         	'';
 
-	fixupPhase = ''
-		runHook preFixup
-		sed -i 's/\bskin\b/value/' $out
-		runHook postFixup
-	'';
+    fixupPhase = ''
+        		runHook preFixup
+        		sed -i 's/\bskin\b/value/' $out
+        		runHook postFixup
+        	'';
 }