Fix monster load with forceLoad

[MillhioreBT]

Pull Request Prelude

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

Changes Proposed

This change adds a reset of the monster info, in case the forceLoad = true. Otherwise, some containers will at best maintain duplications, such as loots and voices.

Before this option did not exist in configManager, so this was not necessary info = {};, it is assumed that this line was the first time that a monster was created on the map.

Thanks @joseluis2g for repoting this problem.

Issues addressed: Nothing!