[Extensions Click-to-Script] Minor chrome://extensions page style tweaks

Bug: 884878
Change-Id: I595c6c8f0a26db7ceafc4f08882c071233162eda
Reviewed-on: https://chromium-review.googlesource.com/1242394Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593805}

chrome/browser/resources/md_extensions/runtime_host_permissions.html

@@ -38,14 +38,18 @@
         justify-content: space-between;
       }
 
+      #host-access {
+        margin-inline-start: 20px;
+      }
+
       a[href] {
         color: var(--google-blue-700);
         text-decoration: none;
       }
     </style>
-    <div id="permissions-mode">
+    <div id="permissions-mode" class="mid-section-header">
       <div>
-        <div class="mid-section-header">
+        <div>
           $i18n{hostPermissionsHeading}
         </div>
         <div>