lxqt.compton-conf: Use compatible qt5 versions

Slightly related to #101369, a follow up to:
https://github.com/NixOS/nixpkgs/commit/4fd58aa4e18c06ead397ad45d68b76d0930c6cbb

pkgs/desktops/lxqt/default.nix

@@ -43,7 +43,7 @@ let
 
     ### OPTIONAL
     qterminal = callPackage ./qterminal {};
-    compton-conf = pkgs.qt5.callPackage ./compton-conf {};
+    compton-conf = qt5.callPackage ./compton-conf {};
     obconf-qt = callPackage ./obconf-qt {};
     lximage-qt = callPackage ./lximage-qt {};
     qps = callPackage ./qps {};

pkgs/top-level/all-packages.nix

@@ -25900,6 +25900,7 @@ in
   lumina = recurseIntoAttrs (callPackage ../desktops/lumina { });
 
   lxqt = recurseIntoAttrs (import ../desktops/lxqt {
+    # TODO: Update these to qt515 at some point
     qt5 = qt514;
     libsForQt5 = libsForQt514;
     inherit pkgs;