Fix bootstrapper parse error in exports — remove forest-brawl type dependency

lan-bootstrapper.gd and noray-bootstrapper.gd both had a host_only()
function that referenced BrawlerSpawner (class_name from forest-brawl).
Since examples/forest-brawl/ is excluded from exports, the type was
undefined, causing the entire script to fail loading with:
  'Could not find type BrawlerSpawner in current scope'

This meant the Join and Host button signal handlers never existed,
so clicking them did nothing — no error shown, no connection, no UI change.

Fix: remove the unused host_only() function from both bootstrapper files.

examples/shared/scripts/noray-bootstrapper.gd

@@ -50,12 +50,6 @@ func disconnect_from_noray():
 	Noray.disconnect_from_host()
 	oid_input.clear()
 
-func host_only():
-	var brawler_spawner: BrawlerSpawner = %"Brawler Spawner"
-	if brawler_spawner != null:
-		brawler_spawner.spawn_host_avatar = false
-	host()
-
 func host():
 	if Noray.local_port <= 0:
 		return ERR_UNCONFIGURED