Fix whitespace errors to silence luacheck.

Currently all minetest_game PR's are failing travis since the
upstream luacheck now also warns about whitespace issues, and
there are a few of those in the code. This fixes all of them
so we can yet again rely on luacheck.

mods/beds/functions.lua

@@ -174,7 +174,7 @@ end
 
 -- Callbacks
 -- Only register respawn callback if respawn enabled
-if enable_respawn then 
+if enable_respawn then
 	-- respawn player at bed if enabled and valid position is found
 	minetest.register_on_respawnplayer(function(player)
 		local name = player:get_player_name()