Fix: Fix alignment of toast message in PasswordsListHandler

The CL fixes a typo in a CSS selector used in crrev.com/c/2254281, which
caused a bad alignment of the Undo button.

The CL also merges the selector with #undoLabel, which is actually a
leftover that has been around since M78 (crrev.com/c/1729469).

Bug: 1099236
Change-Id: I8315fafd4e4c20be66324d9cc013872066e9f362
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2266877Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Victor Vianna <victorvianna@google.com>
Cr-Commit-Position: refs/heads/master@{#782915}

chrome/browser/resources/settings/autofill_page/passwords_list_handler.html

     <style>
-      #undoLabel {
+      #removalNotification {
         display: flex;
         flex: 1;
         overflow: hidden;
@@ -7,10 +7,6 @@
         white-space: nowrap;
       }
 
-      #toastContent {
-        display: flex;
-        flex: 1;
-      }
     </style>
 
     <slot name="body"></slot>