Print Preview Refresh: Fix cut off cr-input in advanced dialog

Also fix a bug where enter still leads to print if one of the
paper-buttons on the page is focused (should open dialog instead).
Previously print preview did not have paper-buttons, so  did not check
this case.

Bug: 887844, 888465
Change-Id: Ie041ace8ea0fd5d62096331efba727af55e935f5
Reviewed-on: https://chromium-review.googlesource.com/1239365
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593713}

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

@@ -47,8 +47,6 @@
       }
 
       cr-input {
-        height: 28px;
-        line-height: 24px;
         width: 239px;
         --cr-input-error-display: none;
       }

chrome/browser/resources/print_preview/new/app.js

@@ -277,7 +277,7 @@ Polymer({
 
     if (e.code == 'Enter' && this.state == print_preview_new.State.READY) {
       const activeElementTag = e.path[0].tagName;
-      if (['BUTTON', 'SELECT', 'A'].includes(activeElementTag))
+      if (['PAPER-BUTTON', 'BUTTON', 'SELECT', 'A'].includes(activeElementTag))
         return;
 
       this.onPrintRequested_();