Print Preview: Fix more settings styling when disabled

- Remove underline
- Use default cursor since the button is not clickable when disabled.

Bug: 875800
Change-Id: Id01f15cbde8afeb7a0e5341e4e04fd91c3b00ea0
Reviewed-on: https://chromium-review.googlesource.com/1182451Reviewed-by: Scott Chen <scottchen@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585294}

chrome/browser/resources/print_preview/new/more_settings.html

@@ -12,6 +12,10 @@
         margin: 10px auto 0;
       }
 
+      :host([disabled]) {
+        pointer-events: none;
+      }
+
       :host button {
         align-items: center;
         background-color: #f6f6f6;