feat(pack): make Distant Horizons mandatory for all clients

DH was optional (default on), which still lets launchers/exporters skip
it and left the server's LOD data unused. Drop the [option] block so it
is required and installed for every client.

index.toml

@@ -231,7 +231,7 @@ metafile = true
 
 [[files]]
 file = "mods/distanthorizons.pw.toml"
-hash = "afed8a03fd6b410c6af339b55a026dc8e77b5b79c6ab0b8c270157fb0d8a2729"
+hash = "6d3e312dbf8db12dd1b6fb3bd1d29f210ab48024a0b2ebdf02fd32c265955c5d"
 metafile = true
 
 [[files]]