feat(messages): read ModifyGhostingDistance

LWOCharacterComponent sends ModifyGhostingDistance (1485: an optional
fDistanceScalar, default 1) on load. All 239 live packets were
the single byte 00 (default scale), so there is nothing for the server to
change; it was logged as an unknown game message. It is now read and
ignored.

Check in game: nothing changes; the world server log no longer has
"Received Unknown GM ... 1485" on each load.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dGame/dGameMessages/GameMessageHandler.cpp

@@ -220,6 +220,7 @@ namespace {
 		{ ACKNOWLEDGE_POSSESSION, []() { return std::make_unique<AcknowledgePossession>(); } },
 		{ TOGGLE_GHOST_REFERENCE_OVERRIDE, []() { return std::make_unique<ToggleGhostReferenceOverride>(); } },
 		{ SET_GHOST_REFERENCE_POSITION, []() { return std::make_unique<SetGhostReferencePosition>(); } },
+		{ MODIFY_GHOSTING_DISTANCE, []() { return std::make_unique<ModifyGhostingDistance>(); } },
 	};
 };