mpv: Use ffmpeg-full

This allows mpv to support more exotic file formats and lavf filters.
Since I am already overring mpv, it should not add another local
rebuild.

users/simon/modules/mpv/default.nix

@@ -50,6 +50,7 @@ in
 
     package = pkgs.wrapMpv
       (pkgs.mpv-unwrapped.override {
+        ffmpeg = pkgs.ffmpeg-full;
         vapoursynthSupport = true;
         vapoursynth = pkgs.vapoursynth.withPlugins (with pkgs; [
           vapoursynth-mvtools