Fix LGTM.com error: Wrong number of arguments in a call

[DimitriPapadopoulos]

• Fix the actual error. Whether some arguments should be made optional (with a default value of None) can be left for later.
• Clearly rampwf.score_types.detection.util.mask_detection_curve is not covered by tests.

Fixes #291.

[codecov]

Codecov Report

Merging #294 (3e5786b) into master (4c71c23) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #294   +/-   ##
=======================================
  Coverage   83.15%   83.15%           
=======================================
  Files         137      137           
  Lines        4748     4748           
=======================================
  Hits         3948     3948           
  Misses        800      800           

Impacted Files	Coverage Δ
rampwf/score_types/detection/util.py	80.64% <0.00%> (ø)

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