LDC-417 Added OG module as dependency

## Ready State: Yes

Relates to https://imagex.atlassian.net/browse/LDC-417

OG module was not automatically added as a dependency on the feature on creation, this fixes that.

## Requirements & Dependencies

None

## Deployment Instructions

* Merge code.
* Enable module `imagex_group`
* Clear caches with `drush cache-clear all`

## Usage/Test Instructions

* Run install & ensure the groups content type contains field_group_group & going to //admin/config/group/fields shows the group content type as a group.