fix(exports): should be able to change export file name

[ghiscoding]

ref Angular-Slickgrid issue #655

[codecov]

Codecov Report

Merging #205 (229db5c) into master (3aca8f9) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #205   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          206       206           
  Lines        11855     11857    +2     
  Branches      4055      4055           
=========================================
+ Hits         11855     11857    +2     

Impacted Files	Coverage Δ
...ages/common/src/extensions/contextMenuExtension.ts	100.00% <100.00%> (ø)
...ackages/common/src/extensions/gridMenuExtension.ts	100.00% <100.00%> (ø)
...ackages/common/src/services/excelExport.service.ts	100.00% <100.00%> (ø)
packages/common/src/services/textExport.service.ts	100.00% <100.00%> (ø)
packages/excel-export/src/excelExport.service.ts	100.00% <100.00%> (ø)
packages/text-export/src/textExport.service.ts	100.00% <100.00%> (ø)

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