Administration: Wrap the list table items count to a new line on small screens.

This avoids overlapping with action buttons and brings some consistency to bottom paddings across various screens.

Props passoniate, afercia, anuj2, rolfsiebers, uxkai, ireneyoast, thijsvanloef, hellofromTonya, audrasjb, helen, SergeyBiryukov.
Fixes #49246.
Built from https://develop.svn.wordpress.org/trunk@49178


git-svn-id: http://core.svn.wordpress.org/trunk@48940 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/users.php

@@ -590,7 +590,7 @@ if ( strlen( $usersearch ) ) {
 		<?php $wp_list_table->display(); ?>
 </form>
 
-<br class="clear" />
+<div class="clear" /></div>
 </div>
 		<?php
 		break;