fix(backend): query should not include pagination option when disabled, fixes #272

[ghiscoding]

No description provided.

[codecov-io]

Codecov Report

Merging #274 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #274      +/-   ##
==========================================
+ Coverage   79.33%   79.34%   +0.02%     
==========================================
  Files         134      134              
  Lines        7323     7327       +4     
  Branches     2419     2523     +104     
==========================================
+ Hits         5809     5813       +4     
  Misses       1514     1514

Impacted Files	Coverage Δ
...s/angular-slickgrid/services/grid-odata.service.ts	99.65% <100%> (+0.01%)	⬆️
...ules/angular-slickgrid/services/graphql.service.ts	100% <100%> (ø)	⬆️

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