fix: spells cooldown if UINT16 is expected

[yrpen]

Description

Fix spells cooldown if UINT16 is expected.
Fix by fusion32 from otland.

Behaviour

Actual

• There is no spell cooldown in client 10.98, after using spell.
• If last hit is done by spell, creature still appear as alive in battle list and game screen
• There is nil value error in OTC

Same issue:
https://otland.net/threads/solved-otclient-lua-exception-attempt-to-index-local-spell-a-nil-value.284728/#post-2722382
https://otland.net/threads/help-request-spell-damage-causes-visual-bug-on-monster-death.284723/#post-2722327

Expected

• Show spell cooldown in client 10.98, after using spell.
• Killed monster die
• There is no error in OTC

Fixes

It is partialy resolve
# #527

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested

• I used exura to test healing spells.
• I used exori vis to test killing monsters with spells

Test Configuration:

• Server Version: TFS 1.4.2
• Client: commit 47a3e59
• Operating System: Linux (Ubuntu 20.04)
• I use docker to run client

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I checked the PR checks reports
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works

[mehah]

do you intend to correct something else in this pr?

[yrpen]

do you intend to correct something else in this pr?

No. I'll create separate Pull Request to add new spells in spellbook and cooldown groups.
But only after I fix my .otui file.