Updated slope definitions

[stoutta6]

Updated slope metadata definitions to be consistent with other software

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.6%. Comparing base (9f96c5f) to head (1c808dd).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main     #42   +/-   ##
=====================================
  Coverage   57.6%   57.6%           
=====================================
  Files          7       7           
  Lines       1322    1322           
=====================================
  Hits         762     762           
  Misses       560     560           

Files with missing lines	Coverage Δ
batbot/__init__.py	42.5% <100.0%> (ø)
batbot/spectrogram/__init__.py	68.8% <ø> (ø)

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[bluemellophone]

LGTM