fix(legacy agents): do not upload themes unless Themerr is enabled

[ReenigneArcher]

Description

Plex runs the Themerr agent even if it is disabled in the agent menu. Due to how we add theme songs using the API (instead of the plugin framework), we need to perform a check to see if we should add the theme or not.

Screenshot

Issues Fixed or Closed

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: 5 lines in your changes are missing coverage. Please review.

Comparison is base (94e5193) 69.84% compared to head (be3ac3c) 70.06%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #342      +/-   ##
==========================================
+ Coverage   69.84%   70.06%   +0.21%     
==========================================
  Files          12       12              
  Lines         985      992       +7     
==========================================
+ Hits          688      695       +7     
  Misses        297      297              

Flag	Coverage Δ
Linux	70.06% <81.48%> (+0.21%)	⬆️
Windows	70.06% <81.48%> (+0.41%)	⬆️
macOS	69.85% <81.48%> (+0.21%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
Contents/Code/__init__.py	74.19% <ø> (ø)
Contents/Code/constants.py	86.84% <100.00%> (+1.12%)	⬆️
Contents/Code/migration_helper.py	85.36% <ø> (ø)
Contents/Code/scheduled_tasks.py	94.44% <ø> (ø)
Contents/Code/themerr_db_helper.py	88.09% <ø> (ø)
Contents/Code/webapp.py	66.46% <ø> (ø)
Contents/Code/youtube_dl_helper.py	74.32% <ø> (ø)
Contents/Code/general_helper.py	92.53% <93.75%> (+0.22%)	⬆️
Contents/Code/plex_api_helper.py	49.49% <50.00%> (-1.49%)	⬇️