Hotfix: ICS-204 Remove panelizer choice from unused view_modes.

## Ready State: Yes

This pull request is related to the following JIRA tickets: [ICS-204](https://imagex.atlassian.net/browse/ICS-204).

This fixes the problem whereby upon save basic page nodes would
not preserve any customizations made to the panelizer display.

This seems to be a problem with features in that these settings
were retained in the feature even after the default and teaser
view modes were set to not be panelized.

## Requirements & Dependencies

* None

## Deployment Instructions

* Merge code.
* Revert feature `imagex_page`: `drush fr imagex_page`
* Clear caches with `drush cache-clear all`

## Usage/Test Instructions

* create page node
* using panels ipe add a block to the layout somewhere
* edit the node/create new draft, modify something
* save and see if the panels layout change you made remains after creating the new draft or updating the existing one