fix(pagination): passing custom pagination sizes should work

[ghiscoding]

• ref, this bug was mentioned in this Stack Overflow question

[codecov]

Codecov Report

Merging #342 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master      #342    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          161       161            
  Lines         9486      9485     -1     
  Branches      3063      3168   +105     
==========================================
- Hits          9486      9485     -1     

Impacted Files	Coverage Δ
...lia-slickgrid/custom-elements/aurelia-slickgrid.ts	100.00% <100.00%> (ø)

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