Fix closing tag for files-metadata-box element

Change-Id: I0f2a77b650d89189086e083c4b909e5c3f0a8dcb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450836
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814508}

ui/file_manager/file_manager/foreground/elements/files_quick_view.html

@@ -96,7 +96,7 @@
             </div>
             </div> <!-- innerContentPanel -->
           </div> <!-- contentPanel -->
-        <files-metadata-box id="metadata-box" hidden$="[[!metadataBoxActive]]"></file-metadata-box>
+        <files-metadata-box id="metadata-box" hidden$="[[!metadataBoxActive]]"></files-metadata-box>
       </div> <!-- mainPanel -->
       <files-tooltip></files-tooltip>
     </dialog>