Patch: Custom Items

wiki link: Custom Items 1.2

I updated the wiki with a bug fix for the mentioned bug.

Inside battle, the issue was that the multiplier for consumable common items was implemented as an special effect ($11A9) and it overwrites any present item special effect, like the special effects for magicite, elixir, smoke bomb, etc.

I added a check to determinate if the common item has an special effect. If it is true, it will not be overwritten. Only items without special effect will have the multiplier effect.