Accessibility: Privacy: Improve the readability of the removed text in Privacy Policy Guide.

Per WCAG 2.0 guidelines, big chunks of italic text should be avoided for better accessibility.

Additionally, replace the legacy `.error` class for "You deactivated this plugin and may no longer need this policy" message with `.notice-info`.

Follow-up to [47147], [48116].

Props afercia, audrasjb.
See #47327, #44621.
Built from https://develop.svn.wordpress.org/trunk@48145


git-svn-id: http://core.svn.wordpress.org/trunk@47914 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/edit-rtl.css

@@ -713,7 +713,6 @@ form#tags-filter {
 }
 
 .text-removed .policy-text {
-	font-style: italic;
 	color: #666;
 	font-weight: 600;
 }

wp-admin/css/edit.css

@@ -712,7 +712,6 @@ form#tags-filter {
 }
 
 .text-removed .policy-text {
-	font-style: italic;
 	color: #666;
 	font-weight: 600;
 }