fix(filters): use defaultFilterOperator in range when none provided

[ghiscoding]

• when using 2 dots notation (2..5), we should use defaultFilterRangeOperator when none is provided and/or isn't a range operator

[codecov]

Codecov Report

Merging #705 (83a05de) into master (7219249) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #705   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          159       159           
  Lines        10611     10617    +6     
  Branches      3754      3756    +2     
=========================================
+ Hits         10611     10617    +6     

Impacted Files	Coverage Δ
...dules/angular-slickgrid/services/filter.service.ts	100.00% <ø> (ø)
...slickgrid/filter-conditions/dateFilterCondition.ts	100.00% <100.00%> (ø)
...ickgrid/filter-conditions/numberFilterCondition.ts	100.00% <100.00%> (ø)

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