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/default/furnace.lua

@@ -4,7 +4,7 @@
 --
 
 local function active_formspec(fuel_percent, item_percent)
-	local formspec = 
+	local formspec =
 		"size[8,8.5]"..
 		default.gui_bg..
 		default.gui_bg_img..

mods/default/player.lua

@@ -94,7 +94,7 @@ minetest.register_on_joinplayer(function(player)
 	default.player_attached[player:get_player_name()] = false
 	default.player_set_model(player, "character.b3d")
 	player:set_local_animation({x=0, y=79}, {x=168, y=187}, {x=189, y=198}, {x=200, y=219}, 30)
-	
+
 	-- set GUI
 	if not minetest.setting_getbool("creative_mode") then
 		player:set_inventory_formspec(default.gui_survival_form)