Resolve spacing issue between the buttons on 'Registering fingerprint' screen

Bug: 881624
Change-Id: Ic2efd91bbccc891f98c5e5e7563996cd8fd138cc
Reviewed-on: https://chromium-review.googlesource.com/c/1440069
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Yulun Wu <yulunwu@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#626797}(cherry picked from commit ee9c93c)
Reviewed-on: https://chromium-review.googlesource.com/c/1443549
Cr-Commit-Position: refs/branch-heads/3683@{#73}
Cr-Branched-From: e510299-refs/heads/master@{#625896}

Author: yulunwu2

chrome/browser/resources/settings/people_page/setup_fingerprint_dialog.html

@@ -39,6 +39,10 @@
       #messageDiv[invisible] {
         visibility: hidden;
       }
+
+      #closeButton {
+        margin-inline-start: 5px;
+      }
     </style>
 
     <cr-dialog id="dialog" on-close="close"