Customizer: Fix searching for available nav menu items by updating reference to nonce.

Fixes regression introduced in [36414] where the nonce for listing available nav menu items was updated to use the new centralized location at `wp.customize.settings.nonce`, but the nonce for search did not get updated.

See #35617.


git-svn-id: https://develop.svn.wordpress.org/trunk@36432 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/js/customize-nav-menus.js

@@ -17,7 +17,6 @@
 
 	// Link settings.
 	api.Menus.data = {
-		nonce: '',
 		itemTypes: [],
 		l10n: {},
 		menuItemTransport: 'postMessage',
@@ -248,7 +247,7 @@
 			$section.addClass( 'loading' );
 			self.loading = true;
 			params = {
-				'customize-menus-nonce': api.Menus.data.nonce,
+				'customize-menus-nonce': api.settings.nonce['customize-menus'],
 				'wp_customize': 'on',
 				'search': self.searchTerm,
 				'page': page