video-trimmer: use ffmpeg-headless, to reduce closure

pkgs/applications/video/video-trimmer/default.nix

···
 , gtk4
 , libadwaita
 , gst_all_1
-, ffmpeg-full
+, ffmpeg-headless
 }:
 
 stdenv.mkDerivation (finalAttrs: {
···
 
   preFixup = ''
     gappsWrapperArgs+=(
-      --prefix PATH : "${lib.makeBinPath [ ffmpeg-full ]}"
+      --prefix PATH : "${lib.makeBinPath [ ffmpeg-headless ]}"
     )
   '';