Remove jellyfin-ffmpeg dep from server package

Being added to the metapackage instead.

debian/control

@@ -20,7 +20,6 @@ Breaks: jellyfin (<<10.6.0)
 Architecture: any
 Depends: at,
          libsqlite3-0,
-         jellyfin-ffmpeg (>= 4.2.1-2),
          libfontconfig1,
          libfreetype6,
          libssl1.1