Fixed bug with 'x' button not firing Modal 'closed' event

[Blackbaud-SteveBrush]

Addresses issue #1031

[codecov-io]

Codecov Report

Merging #1085 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #1085   +/-   ##
======================================
  Coverage     100%    100%           
======================================
  Files         351     351           
  Lines        6477    6472    -5     
  Branches      838     837    -1     
======================================
- Hits         6477    6472    -5

Impacted Files	Coverage Δ
src/modules/modal/modal-instance.ts	100% <ø> (ø)	⬆️
src/modules/modal/modal-host.service.ts	100% <100%> (ø)	⬆️
src/modules/modal/modal-host.component.ts	100% <100%> (ø)	⬆️
src/modules/modal/modal.component.ts	100% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 73b615b...a644d90. Read the comment docs.