Hotfix: Remove unnecessary function calls in install hooks.

## Ready State: Yes

Some unnecessary function calls were accidentally left after moving the variable function to utilize hook_imagex_variables. This removes them.

## Requirements & Dependencies

* None

## Deployment Instructions

* Merge code.
* Install `imagex_media` from scratch.
* Clear caches with `drush cache-clear all`

## Usage/Test Instructions

* Make sure install is error free and variables are set.