Administration: Improve the CSS for the Site Health pages header.

Avoids the Site Health pages header layout to break when the Hello Dolly plugin or other floated content is printed out at the top of the page.

Props xkon.
Fixes #46650.

Built from https://develop.svn.wordpress.org/trunk@45072


git-svn-id: http://core.svn.wordpress.org/trunk@44881 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/site-health-rtl.css

@@ -33,6 +33,7 @@
 	display: flex;
 	align-items: center;
 	justify-content: center;
+	clear: both;
 }
 
 .site-health-progress {

wp-admin/css/site-health.css

@@ -33,6 +33,7 @@
 	display: flex;
 	align-items: center;
 	justify-content: center;
+	clear: both;
 }
 
 .site-health-progress {

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.2-beta1-45071';
+$wp_version = '5.2-beta1-45072';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.