fix(firefox): thousand separator regex lookbehind not allow, fixes #336

[ghiscoding]

No description provided.

[codecov]

Codecov Report

Merging #337 into master will decrease coverage by 0.04%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #337      +/-   ##
==========================================
- Coverage   99.71%   99.67%   -0.03%     
==========================================
  Files         138      138              
  Lines        8041     8044       +3     
  Branches     2733     2623     -110     
==========================================
  Hits         8017     8017              
- Misses         24       27       +3

Impacted Files	Coverage Δ
...pp/modules/angular-slickgrid/services/utilities.ts	100% <100%> (ø)	⬆️
...modules/angular-slickgrid/services/grid.service.ts	98.98% <0%> (-1.02%)	⬇️

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