Removed unnecessary check in setMonsterOutfit function

[EPuncker]

Pull Request Prelude

• [x] I have followed proper The Forgotten Server code styling.
• [x] I have read and understood the contribution guidelines before making this PR.
• [x] I am aware that this PR may be closed if the above-mentioned criteria are not fulfilled.

Changes Proposed

it was preventing items like costume bags to change player outfit because monster list was not illusionable but was allowed in this item, in other words this check is useless and only breaks functionality

credits to @omarcopires for bringing this up to my attention

Issues addressed: