Use correct network admin icon. props PeteMall, see #15174.

git-svn-id: http://svn.automattic.com/wordpress/trunk@15907 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/network/site-info.php

@@ -77,7 +77,7 @@ require('../admin-header.php');
 ?>
 
 <div class="wrap">
-<?php screen_icon('index'); ?>
+<?php screen_icon('ms-admin'); ?>
 <h2 id="edit-site"><?php echo $title ?></h2>
 <h3>
 <?php

wp-admin/network/site-options.php

@@ -65,7 +65,7 @@ require('../admin-header.php');
 ?>
 
 <div class="wrap">
-<?php screen_icon('index'); ?>
+<?php screen_icon('ms-admin'); ?>
 <h2 id="edit-site"><?php echo $title ?></h2>
 <h3>
 <?php

wp-admin/network/site-themes.php

@@ -61,7 +61,7 @@ require('../admin-header.php');
 ?>
 
 <div class="wrap">
-<?php screen_icon('index'); ?>
+<?php screen_icon('ms-admin'); ?>
 <h2 id="edit-site"><?php echo $title ?></h2>
 <h3>
 <?php

wp-admin/network/site-users.php

@@ -109,7 +109,7 @@ require('../admin-header.php');
 ?>
 
 <div class="wrap">
-<?php screen_icon('index'); ?>
+<?php screen_icon('ms-admin'); ?>
 <h2 id="edit-site"><?php echo $title ?></h2>
 <h3>
 <?php

wp-admin/network/sites.php

@@ -97,7 +97,7 @@ switch ( $action ) {
 		?>
 
 		<div class="wrap">
-		<?php screen_icon('index'); ?>
+		<?php screen_icon('ms-admin'); ?>
 		<h2><?php _e('Sites') ?>
 		<?php echo $msg; ?>
 		<a href="<?php echo network_admin_url('site-new.php'); ?>" class="button add-new-h2"><?php echo esc_html_x( 'Add New', 'sites' ); ?></a>