fix(gridService): addItem/updatedItemById pass array to setSelectedRows

[ghiscoding]

ref Angular-Slickgrid ref #308

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@017f93d). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #234   +/-   ##
=========================================
  Coverage          ?   96.96%           
=========================================
  Files             ?      149           
  Lines             ?     7936           
  Branches          ?     2569           
=========================================
  Hits              ?     7694           
  Misses            ?      242           
  Partials          ?        0

Impacted Files	Coverage Δ
src/aurelia-slickgrid/services/grid.service.ts	100% <100%> (ø)

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