Remove "wml-utils" require from files that no longer use it

data/lua/on_event.lua

@@ -1,4 +1,3 @@
-local utils = wesnoth.require "wml-utils"
 -- registers an event handler. note that, like all lua variables this is not persitent in savefiles,
 -- so you have to call this function from a toplevel lua tag or from a preload event.
 -- It is also not possible to use this for first_time_only=yes events.

data/lua/wml/endlevel.lua

@@ -1,4 +1,3 @@
-local utils = wesnoth.require "wml-utils"
 local already_ended = false
 
 function wesnoth.wml_actions.endlevel(cfg)

data/lua/wml/move_unit.lua

@@ -1,4 +1,3 @@
-local utils = wesnoth.require "wml-utils"
 
 local function path_locs(path)
 	if path.location_id then