fix: set count of ignored word to N

[mammothb]

Previously the count of these ignored words were set to 0, causing lookup_compound to always return suggestion count as 0 after it was changed to use Naive Bayes probability.

This sets the count of ignored words to N so they will not affect the final suggestion count/probability.

[codecov]

Codecov Report

Merging #108 (84121c5) into master (1098ff2) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #108   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines          820       820           
  Branches       196       196           
=========================================
  Hits           820       820           

Impacted Files	Coverage Δ
symspellpy/symspellpy.py	100.00% <100.00%> (ø)

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