Settings UI was using wrong variable name (MIN_QUALITY_SCORE) while
code reads MIN_SIGNAL_QUALITY_SCORE. This caused quality score changes
in settings UI to have no effect.
Fixed:
- Settings API now reads/writes MIN_SIGNAL_QUALITY_SCORE
- Updated .env file to use correct variable name
- User's quality score increase to 81 will now work
Related: User increased min quality from 60 to 81 to filter out
small chop trades (avoiding -$99 trade with quality score 80).
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