Custom JS text area in customizer is being formatted wrong in document

I have created a wordpress theme, in the wordpress theme customizer I have added a couple of text areas where a user can input their own CSS or JS to be added to the head.

The placement of the text area is fine, i.e. when a user adds code it is displayed on the right place in the page, however it is being formatted differently.

For example, I add the following code to one of the textareas:

jQuery(document).ready(function($){
    $('full_page').css('min-height',($(window).height()-195));  
});

And in my theme it is outputted like this:

jQuery(document).ready(function($){
    $('full_page').css('min-height',($(window).height()-195));  
});

As you can see, the ' is being replaced with '

Here is the code in my customizer.php file to create the text area:

$controls[] = array(
        'type'     => 'textarea',
        'setting'  => 'js',
        'label'    => __( 'Custom JS', 'skizzar_bootstrap' ),
        'subtitle' => __( 'You can write your custom JavaScript/jQuery here. The code will be included in a script tag appended to the top of the page.', 'skizzar_bootstrap' ),
        'section'  => 'advanced',
        'priority' => 6,
        'default'  => '',
    );

Is there a way to stop this formatting from happening?