Core: Adding panelizer defaults to wiki

## Ready State: (Yes)

This pull request is related to the following JIRA tickets: [LDC-187: Implement a default panelized pages for all content types](https://imagex.atlassian.net/browse/LDC-187).

## Deployment Instructions

* Merge code.
* Enable ImageX Wiki Feature
* Clear caches with `drush cache-clear all`

## Usage/Test Instructions

* Check content type to ensure it has panelizer enabled