fix restricted access bug

fixes CNVS-16095

Changed some wording and now when you select a "from" date, and re-open
the restricted access form, it will keep state by default.

Test Plan
-------------
Given you're on new files
And you have a file or folder
When you click the 'restricted access icon'
And you click on the restricted access radio button
And select ONLY a 'lock from' date
And you save
And you re-open the restricted access dialog
Then the restricted access radio button should be selected by default
And it should be filled in with the correct date

Change-Id: I6fae117cc5db9712c537c9c586987106208e1199
Reviewed-on: https://gerrit.instructure.com/42342
Reviewed-by: Dan Minkevitch <dan@instructure.com>
Product-Review: Cosme Salazar <cosme@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Jahnavi Yetukuri <jyetukuri@instructure.com>