Extensions WebUI: when showing errors, remove extra dom-if for code section

Bug: 935334
Change-Id: Ib82d26cda4b4056da4dfa474a376d226949e72bd
Reviewed-on: https://chromium-review.googlesource.com/c/1490396Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Esmael El-Moslimany <aee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635842}

chrome/browser/resources/md_extensions/error_page.html

@@ -66,7 +66,7 @@
 
       .error-item {
         @apply --cr-section;
-        padding-left: 0;
+        padding-inline-start: 0;
       }
 
       .error-item paper-icon-button-light {
@@ -202,12 +202,9 @@
                         </template>
                       </ul>
                     </template>
-                    <template is="dom-if"
-                        if="[[isOpened_(index, selectedEntry_)]]">
-                      <extensions-code-section code="[[code_]]"
-                          could-not-display-code="$i18n{noErrorsToShow}">
-                      </extensions-code-section>
-                    </template>
+                    <extensions-code-section code="[[code_]]"
+                        could-not-display-code="$i18n{noErrorsToShow}">
+                    </extensions-code-section>
                   </div>
                 </iron-collapse>
               </div>