Add accepted types attribute to file input

[Blackbaud-PatrickOFriel]

#594 #592

[codecov-io]

Codecov Report

Merging #658 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #658   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files         278    278           
  Lines        4738   4740    +2     
  Branches      536    537    +1     
=====================================
+ Hits         4738   4740    +2

Impacted Files	Coverage Δ
src/modules/fileattachments/file-drop.component.ts	100% <100%> (ø)	⬆️

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