[FIX] update ItemType retrieval to use 'id'

[Geuthur]

Description

Fixed

• update ItemType retrieval to use 'id'

Type of Changes

Please select the type of changes made in this pull request:

• Bug Fix (non-breaking change which fixes an Issue)
• New Feature (non-breaking change)
• Other (please specify):

Checklist

Please ensure the following before submitting your pull request:

• I have read the contributing guidelines.
• My code follows the code style of this project.
• I have performed a self-review of my code.
• I have commented my code where necessary.
• All new and existing tests passed.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
killstats/helpers/killmail.py	0.00%	1 Missing ⚠️

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
+ Coverage   67.37%   69.70%   +2.33%     
==========================================
  Files          30       30              
  Lines        1422     1422              
  Branches      137      137              
==========================================
+ Hits          958      991      +33     
+ Misses        429      387      -42     
- Partials       35       44       +9     

Files with missing lines	Coverage Δ
killstats/managers/killboard_manager.py	56.25% <100.00%> (+16.67%)	⬆️
killstats/helpers/killmail.py	76.29% <0.00%> (+4.59%)	⬆️

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