Editor: Correct vertical alignment for "Published on" month dropdown …

…in Classic Editor.

Props pratik-jain, justinahinon, audrasjb.
Merges [47072] to the 5.3 branch.
Fixes #49115.

git-svn-id: https://develop.svn.wordpress.org/branches/5.3@47129 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/css/edit.css

@@ -421,7 +421,7 @@ form#tags-filter {
 #timestampdiv select {
 	vertical-align: top;
 	font-size: 12px;
-	line-height: 1.5; /* 18px */
+	line-height: 2.33333333; /* 28px */
 }
 
 #aa, #jj, #hh, #mn {