Reversing selection of all checkboxes in the UC Attributes options page, via custom module

I have a product where there are many colors available, but each product will only have one color. Currently, when you put up a new product, the admin has to deselect more than 20 checkboxes, which is rather cumbersome.

I want to stop the uc_attributes from selecting all of the Options on the ../edit/options page. I would like to do this correctly and use the hook_form_alter in a custom module--and avoid versioning problems in the future.

Can someone please help me out with the below code? I just need to get the if statement correct and this should work.

<?php

function mb_custom_form_alter(&$form, &$form_state, $form_id) {

	if ($form_id == 'uc_object_attributes_form') { /** THIS LINE NEEDS TO BE CORRECTED **/
  		$form["#submit"][] = 'mb_attribute_form_submit';
	}

}


function mb_attribute_form_submit($form, &$form_state) {
    if($form_state['values']['view'] == 'add') {
        $attribute = uc_attribute_load($aid);
        foreach ($attribute->options as $option) {
            db_query("DELETE FROM {uc_product_options} WHERE nid = %d AND oid = %d", $form_state['values']['id'], $option->oid);
        }
    }
}