Administration: Correct alignment of form controls inside custom meta boxes.

Props audrasjb, dontdream, valentinbora.
Fixes #49013.

git-svn-id: https://develop.svn.wordpress.org/trunk@47289 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/css/forms.css

@@ -396,6 +396,10 @@ input[type="radio"].disabled:checked:before {
 	max-width: 100%;
 }
 
+.meta-box-sortables input {
+	vertical-align: middle;
+}
+
 .misc-pub-post-status select {
 	margin-top: 0;
 }