Modals in calendar don't load and display content smoothly

Please test on both Clean and Boost themes Calendar test (master only) Log in as any user Go to the calendar Create a new event by either clicking the “new event” button or clicking on one of the days in the calendar CONFIRM that the modal open and shows a loading icon and the height change of the modal is animated and the form fades in (it’s very quick) Fill out the form and save the new event Click on the event in the calendar CONFIRM that the modal shows a loading icon and the height change is animated General test (master, 33, and 32) Add the test files to your local moodle instance Either: Cherry pick the commit from git@github.com:ryanwyllie/moodle.git MDL-60489 -master-test 19fc550406be0a5769f08aa2f00ba70099097fe6 Download the attached files from this issue and place them in lib/templates/test_modal.mustache and in the root directory modal_test.php Navigate to <your_moodle>/modal_test.php Read through each of the test scenarios and click the “open” button on each to see the modal work CONFIRM that the modal appears as described in each test scenario