don't wrap invalid fields in a fieldWithErrors div, fixes CNVS-9761
don't wrap invalid fields in a fieldWithErrors div, fixes CNVS-9761

we don't need this default rails behavior anywhere, and it can be used to
harvest usernames on the login page (i.e. a valid vs. invalid usernames
will result in a fieldWithErrors in a different place)

test plan:
1. go to the login page
2. submit a valid username and an invalid password
3. in the js console, $('.fieldWithErrors'), should return []
4. submit an invalid username and any password
5. in the js console, $('.fieldWithErrors'), should return []

Change-Id: Ie434d0e6af70319469625694c060ebd15cf9f67f
Reviewed-on: https://gerrit.instructure.com/27107
Reviewed-by: Jon Jensen <44f878afe53efc66b76772bd845eb65944ed8232@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Marc LeGendre <d33c80bc45d65303e33ca83108a9952b745af9ef@instructure.com>
Product-Review: Marc LeGendre <d33c80bc45d65303e33ca83108a9952b745af9ef@instructure.com>

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