fix(Pagination): update handling of onClick for ellipsisItem

[layershifter]

Fixes #3490.

Allows to correctly handle onClick on ellipsisItem:

<Pagination
  defaultActivePage={5}
  ellipsisItem={{
    content: '...',
    onClick: (e, props) => console.log('ellipsisItem click', props),
  }}
  totalPages={10}
/>

[codecov-io]

Codecov Report

Merging #3493 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3493      +/-   ##
==========================================
- Coverage   99.82%   99.82%   -0.01%     
==========================================
  Files         172      172              
  Lines        2805     2804       -1     
==========================================
- Hits         2800     2799       -1     
  Misses          5        5

Impacted Files	Coverage Δ
src/addons/Pagination/PaginationItem.js	100% <100%> (ø)	⬆️
src/addons/Pagination/Pagination.js	100% <100%> (ø)	⬆️

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[levithomason]

Released in [email protected].