Revert "mpv: clear-speed: Use firefox’s scaletempo config"

This reverts commit 3b2f41f18a.

users/simon/modules/mpv.nix

@@ -216,10 +216,8 @@ in
           tscale-clamp = 0.0;
         };
 
-        # adapted from firefox’s SoundTouch configuration (10 ms sequence,
-        # 15 ms seek window, 8 ms overlap)
-        # https://searchfox.org/mozilla-central/rev/9ae77e4ce3378bd683ac9a86b729ea6b6bd22cb8/dom/media/AudioStream.cpp#173
-        clear-speed.af-add = "scaletempo=stride=10:search=15:overlap=.53333";
+        # adapted from https://github.com/mpv-player/mpv/issues/4418#issuecomment-368272929
+        clear-speed.af-add = "scaletempo=stride=18:overlap=.6:search=10";
       };
 
     scripts = [