Update the menu path for the moved admin form.

includes/admin.form.inc

@@ -16,7 +16,7 @@
  * @return array
  *   The Drupal form definition.
  */
-function islandora_repository_admin(array $form, array &$form_state) {
+function islandora_admin_form(array $form, array &$form_state) {
   module_load_include('inc', 'islandora', 'includes/utilities');
   drupal_add_css(drupal_get_path('module', 'islandora') . '/css/islandora.admin.css');
 

islandora.module

@@ -64,8 +64,8 @@ function islandora_menu() {
     'title' => 'Configuration',
     'description' => 'Configure settings for Islandora.',
     'page callback' => 'drupal_get_form',
-    'page arguments' => array('islandora_repository_admin'),
-    'file' => 'admin/islandora.admin.inc',
+    'page arguments' => array('islandora_admin_form'),
+    'file' => 'includes/admin.form.inc',
     'access arguments' => array('administer site configuration'),
     'type' => MENU_NORMAL_ITEM,
     'weight' => -1,