fix(resizer): allow gridHeight/gridWidth to be passed as string

[ghiscoding]

• fixes Aurelia-Slickgrid issue #534

[codecov]

Codecov Report

Merging #284 (9624426) into master (bb7dcd3) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #284   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          209       209           
  Lines        12436     12436           
  Branches      4253      4254    +1     
=========================================
  Hits         12436     12436           

Impacted Files	Coverage Δ
...ges/vanilla-bundle/src/services/resizer.service.ts	100.00% <100.00%> (ø)

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