Take out short breakpoints on Welcome Screen for new users
Take out short breakpoints on Welcome Screen for new users

refs: CNVS-27361

Test Plan:
- Make sure browser window is a small height
- There should no longer be any margin difference at top
  screenshot: http://cl.ly/0b0o282k321z

Change-Id: I9390ea2cd72d4f40427f1fd1e2707ddc07b300b4
Reviewed-on: https://gerrit.instructure.com/73277
Tested-by: Jenkins
Reviewed-by: Jennifer Stern <7e594e5cba47371ac9ee694a84b9d94f9f6ec815@instructure.com>
Product-Review: Jennifer Stern <7e594e5cba47371ac9ee694a84b9d94f9f6ec815@instructure.com>
QA-Review: Myller de Araujo <e5c7c5e1b7f2ce5e9870cc98ec52b20b3006cb48@instructure.com>

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