Fix ie dropdown scroll

[blackbaud-conorwright]

Fixing issue #1536 where fullscreen dropdowns were not able to scroll in IE11 and Edge

[blackbaud-sky-savage]

Tests failed. Automated cross-browser testing via BrowserStack and Travis CI shows that the JavaScript changes in this pull request are: BUSTED

Commit: 0cc6974
Build details: https://travis-ci.org/blackbaud-sky-savage/skyux2/builds/368818721

(Please note that this is a fully automated comment.)

[codecov-io]

Codecov Report

Merging #1642 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1642   +/-   ##
=======================================
  Coverage   99.98%   99.98%           
=======================================
  Files         395      395           
  Lines        8069     8069           
  Branches     1183     1183           
=======================================
  Hits         8068     8068           
  Misses          1        1

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[blackbaud-sky-savage]

Tests passed. Automated cross-browser testing via BrowserStack and Travis CI shows that the JavaScript changes in this pull request are: CONFIRMED

Commit: 29e5edb
Build details: https://travis-ci.org/blackbaud-sky-savage/skyux2/builds/368832635

(Please note that this is a fully automated comment.)

[blackbaud-sky-savage]

Tests failed. Automated cross-browser testing via BrowserStack and Travis CI shows that the JavaScript changes in this pull request are: BUSTED

Commit: 7a0ade0
Build details: https://travis-ci.org/blackbaud-sky-savage/skyux2/builds/370102322

(Please note that this is a fully automated comment.)

[blackbaud-sky-savage]

Tests passed. Automated cross-browser testing via BrowserStack and Travis CI shows that the JavaScript changes in this pull request are: CONFIRMED

Commit: 978b0aa
Build details: https://travis-ci.org/blackbaud-sky-savage/skyux2/builds/370135479

(Please note that this is a fully automated comment.)