LX-309 Modify CAPA choicegroup problems to make custom radio/checkboxes possible

Description

The LabXchange project requires custom styling of the radio/checkbox problems, which, due to the element structure, could not be done with CSS alone. We made some changes to the DOM to facilitate these customizations, which this PR submits upstream:

*JIRA tickets*: OSPR

*Screenshots*:

Status icon for radio button problems moved:

![moves status icon](https://user-images.githubusercontent.com/7556571/61857410-44782d00-af03-11e9-8965-5b6e3bf0a880.png)

The other UI changes do not change the appearance of the CAPA problems.

*Sandbox URL*: TBD - sandbox is being provisioned.

*Merge deadline*: None

*Testing instructions*:

TBD

*Reviewers*

  • [ ] @symbolist

  • [ ] edX reviewer[s] TBD

CC @ormsbee

Status

Assignee

David Ormsbee

Reporter

Open Source Pull Request Bot

Labels

Contributor Name

Jillian Vogel

Repo

edx/edx-platform

Customer

Epic Link

None

OSCM Assignee

None

Priority

Unset
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