Fix loading the plugins config

[Pwuts]

Background

📷 @NeonN3mesis

Changes

• Do PluginsConfig.load_config after determining config.plugins_config_file

Documentation

x

Test Plan

CI

PR Quality Checklist

• My pull request is atomic and focuses on a single change.
• I have thoroughly tested my changes with multiple different prompts.
• I have considered potential risks and mitigations for my changes.
• I have documented my changes clearly and comprehensively.
• I have not snuck in any "extra" small tweaks changes.
• I have run the following commands against my code to ensure it passes our linters:

  black .
  isort .
  mypy
  autoflake --remove-all-unused-imports --recursive --ignore-init-module-imports --ignore-pass-after-docstring autogpt tests --in-place

[netlify]

✅ Deploy Preview for auto-gpt-docs canceled.

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.06 ⚠️

Comparison is base (376ecf0) 51.00% compared to head (0a40f5c) 50.95%.

Additional details and impacted files

@@                Coverage Diff                 @@
##           release-v0.4.5    #5000      +/-   ##
==================================================
- Coverage           51.00%   50.95%   -0.06%     
==================================================
  Files                 118      118              
  Lines                4884     4885       +1     
  Branches              643      643              
==================================================
- Hits                 2491     2489       -2     
- Misses               2212     2215       +3     
  Partials              181      181              

Impacted Files	Coverage Δ
autogpt/config/config.py	80.72% <100.00%> (+0.11%)	⬆️

... and 1 file with indirect coverage changes

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