fix display issue on scheduler.
fix display issue on scheduler.

fixes CNVS-3738

previousy, display of the scheduler page would be off if
only one, nameless appointment was present and the user
attempted to click its gear menu.

now we expand the height of the appointment group list to
avoid clipping and layout issues.

test plan:
  * enable calendar2 and scheduler on an account;
  * as a user with permissions to create an appointment,
    create an appointment with no name;
  * reload the page, click the gear menu, and verify that
    the layout of the page is not affected.

Change-Id: I6daddd5672760c427b34c103912d86976af1e7e0
Reviewed-on: https://gerrit.instructure.com/17690
Reviewed-by: Joel Hough <4816dabf8db1bc6cac35b3a24cab2ff844b5b0c7@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Marc LeGendre <d33c80bc45d65303e33ca83108a9952b745af9ef@instructure.com>

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