convert remove_items to avoid crashes

hdastwb

2013-07-20 17f3ce2ba37918c828046dbba4cb069415e90a71

convert remove_items to avoid crashes

 item_drop/item_entity.lua

@@ -88,7 +88,7 @@
    end,
    
    on_step = function(self, dtime)
        local time = minetest.setting_get("remove_items")
        local time = tonumber(minetest.setting_get("remove_items"))
        if not time then
            time = 300
        end