Login and Registration: Fix password icon alignment.

Change the line-height of the `button` element for toggling password visibility to center the icon vertically.

Props wildworks, niravsherasiya7707, khushi1501, joedolson.
Fixes #64869.

git-svn-id: https://develop.svn.wordpress.org/trunk@62038 602fd350-edb4-49c9-b593-d223f7449a82

Author: joedolson

src/wp-admin/css/login.css

@@ -105,7 +105,7 @@ p {
 	border: 1px solid transparent;
 	box-shadow: none;
 	font-size: 14px;
-	line-height: 2;
+	line-height: normal;
 	width: 2.5rem;
 	height: 2.5rem;
 	min-width: 40px;