fnott: add zlib license to list

fnott bundles nanosvg in-tree and builds with it, which is licensed
under the zlib license. The `license` meta-attr should reflect this (as
this more or less means nanosvg is part of the project), thus add the
zlib license to it.

See the pull-request discussion [0] and other precedents like [1].

[0] https://github.com/NixOS/nixpkgs/pull/225224
[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982145#74

Signed-off-by: Christoph Heiss <christoph@c8h4.io>

pkgs/applications/misc/fnott/default.nix

@@ -49,7 +49,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     homepage = "https://codeberg.org/dnkl/fnott";
     description = "Keyboard driven and lightweight Wayland notification daemon for wlroots-based compositors";
-    license = licenses.mit;
+    license = with licenses; [ mit zlib ];
     maintainers = with maintainers; [ polykernel ];
     platforms = platforms.linux;
   };