LDC-625 Delete permission `view admin theme`

## Ready State: Yes

#### JIRA Reference: https://imagex.atlassian.net/browse/LDC-625

Delete permission `view admin theme`.

## Requirements & Dependencies

* Requires pull request https://github.com/imagex/linux.com/pull/373.

## Deployment Instructions

* Merge code.
* `drush fr `imagex_user_permissions -y`
* Clear caches with `drush cache-clear all`

## Usage/Test Instructions
* Login user and create question or answer.