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.

pack.toml

@@ -6,7 +6,7 @@ pack-format = "packwiz:1.1.0"
 [index]
 file = "index.toml"
 hash-format = "sha256"
-hash = "5d80cc72339166684ef1cea024dffddcbbd8afbdb85025851bbe8d6171cd428f"
+hash = "f4af7f3faa2759f380078d0d04bbbf97bc5735bfae39eff72abb487af71f1186"
 
 [versions]
 minecraft = "1.21.1"