Fixed dropdown aborting click events

[Blackbaud-SteveBrush]

Addresses: #1537

[codecov-io]

Codecov Report

Merging #1640 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #1640   +/-   ##
=======================================
  Coverage   99.98%   99.98%           
=======================================
  Files         395      395           
  Lines        8110     8108    -2     
  Branches     1194     1194           
=======================================
- Hits         8109     8107    -2     
  Misses          1        1

Impacted Files	Coverage Δ
src/modules/popover/popover.directive.ts	100% <100%> (ø)	⬆️

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[Blackbaud-PaulCrowder]

Should we have a unit test here to ensure the old behavior doesn't creep back in, perhaps as a result of a botched merge in the future?

[Blackbaud-SteveBrush]

@Blackbaud-PaulCrowder I added a unit test. I also confirmed that this test fails on the master branch.