Management WebUI: fix back button bounce

Bug: 995251
Change-Id: I2c268a4def6e1ef8a13bd661b15bc96fe63bde29
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1761148Reviewed-by: Dan Beam <dbeam@chromium.org>
Commit-Queue: Yann Dago <ydago@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688532}

chrome/browser/resources/management/management_ui.html

@@ -52,9 +52,10 @@
 
       .page-subtitle {
         align-items: center;
+        box-sizing: border-box;
         flex-direction: row;
         justify-content: start;
-        min-height: 40px;
+        min-height: 73px;
         padding-bottom: 24px;
         padding-top: 6px;
       }