Fix SkyDatePipeModule providers and imports

[Blackbaud-SteveBrush]

Issue: https://github.com/blackbaud/skyux-datetime/issues/57

[codecov]

Codecov Report

Merging #58 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #58   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          26     26           
  Lines        1315   1316    +1     
  Branches      200    200           
=====================================
+ Hits         1315   1316    +1

Impacted Files	Coverage Δ
...c/app/public/modules/date-pipe/date-pipe.module.ts	100% <100%> (ø)	⬆️

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