script: Replace calls to depreated luaL_openlib

src/script/lua_api/l_localplayer.cpp

@@ -446,7 +446,7 @@ void LuaLocalPlayer::Register(lua_State *L)
 
 	lua_pop(L, 1); // Drop metatable
 
-	luaL_openlib(L, 0, methods, 0); // fill methodtable
+	luaL_register(L, nullptr, methods); // fill methodtable
 	lua_pop(L, 1);			// Drop methodtable
 }