Fix ValueError when APK score is negative

[haeter525]

Close #760

When an APK receives a score higher than the total rule score or below zero, Weight.calculate() raises a ValueError, which causes issue #760. This PR enhances Weight.calculate() to handle APK scores in these two cases:

• If an APK receives scores higher than the total rule score, Weight.calculate() now categorizes it as high-risk.
• If an APK receives scores below zero, Weight.calculate() now categorizes it as low-risk.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.65%. Comparing base (d4493b3) to head (29f04ad).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #761      +/-   ##
==========================================
- Coverage   80.68%   80.65%   -0.04%     
==========================================
  Files          75       75              
  Lines        6253     6243      -10     
==========================================
- Hits         5045     5035      -10     
  Misses       1208     1208              

Flag	Coverage Δ
unittests	80.65% <100.00%> (-0.04%)	⬇️

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[pulorsok]

LGTM