fix: generate kodi_id for cases where a list item has no DBID

[ReenigneArcher]

Description

Video addons do not have a DBID. This PR modifies Themerr's behavior to use a generated kodi_id instead of using the DBID.

Todo:

• Update unit tests

Screenshot

Issues Fixed or Closed

• Fixes not working with Fen and Artic Fuse #18

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

Branch Updates

LizardByte requires that branches be up-to-date before merging. This means that after any PR is merged, this branch
must be updated before it can be merged. You must also
Allow edits from maintainers.

• I want maintainers to keep my branch updated

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (4d576bd) 82.13% compared to head (674f114) 84.56%.

Files	Patch %	Lines
src/themerr/gui.py	63.88%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #22      +/-   ##
==========================================
+ Coverage   82.13%   84.56%   +2.43%     
==========================================
  Files          11       11              
  Lines         319      324       +5     
==========================================
+ Hits          262      274      +12     
+ Misses         57       50       -7     

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