improve FilterRedundantPointPen when starting points are differently set

[typemytype]

fixes #276

[codecov]

Codecov Report

Merging #277 (f0e9618) into master (6ff50f8) will increase coverage by 0.36%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master     #277      +/-   ##
==========================================
+ Coverage   88.43%   88.80%   +0.36%     
==========================================
  Files          13       13              
  Lines        2378     2349      -29     
  Branches      329      320       -9     
==========================================
- Hits         2103     2086      -17     
+ Misses        199      195       -4     
+ Partials       76       68       -8     

Flag	Coverage Δ
unittests	88.76% <85.71%> (+0.36%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
Lib/fontMath/mathGlyph.py	81.40% <85.71%> (+1.28%)	⬆️

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