i3lock-pixeled: github -> gitlab

Additionally `pkgs` has been removed which makes possible overrides
*way* easier.

pkgs/misc/screensavers/i3lock-pixeled/default.nix

@@ -1,15 +1,17 @@
-{ stdenv, pkgs, fetchurl }:
+{ stdenv, i3lock, imagemagick, scrot, playerctl, fetchFromGitLab }:
 
 stdenv.mkDerivation rec {
   name = "i3lock-pixeled-${version}";
   version = "1.2.0";
 
-  src = fetchurl {
-    url = "https://github.com/Ma27/i3lock-pixeled/archive/${version}.tar.gz";
-    sha256 = "0vlynm833fk1mmdnkcgh4hwqmfypn22zskhysm110k39zvikif0h";
+  src = fetchFromGitLab {
+    owner = "Ma27";
+    repo = "i3lock-pixeled";
+    rev = version;
+    sha256 = "0pysx9sv4i3nnjvpqkrxkxaqja2a2dw5f2r1bzjcgg3c3c5qv74b";
   };
 
-  propagatedBuildInputs = with pkgs; [
+  propagatedBuildInputs = [
     i3lock
     imagemagick
     scrot
@@ -22,15 +24,15 @@ stdenv.mkDerivation rec {
 
   patchPhase = ''
     substituteInPlace i3lock-pixeled \
-       --replace i3lock    "${pkgs.i3lock}/bin/i3lock" \
-       --replace convert   "${pkgs.imagemagick}/bin/convert" \
-       --replace scrot     "${pkgs.scrot}/bin/scrot" \
-       --replace playerctl "${pkgs.playerctl}/bin/playerctl"
+       --replace i3lock    "${i3lock}/bin/i3lock" \
+       --replace convert   "${imagemagick}/bin/convert" \
+       --replace scrot     "${scrot}/bin/scrot" \
+       --replace playerctl "${playerctl}/bin/playerctl"
   '';
 
   meta = with stdenv.lib; {
     description = "Simple i3lock helper which pixels a screenshot by scaling it down and up to get a pixeled version of the screen when the lock is active.";
-    homepage = https://github.com/Ma27/i3lock-pixeled;
+    homepage = https://gitlab.com/Ma27/i3lock-pixeled;
     license = licenses.mit;
     platforms = platforms.linux;
     maintainers = with maintainers; [ ma27 ];