Fix incorrect string on Network Files Shares settings page

In https://chromium-review.googlesource.com/c/chromium/src/+/1616999
hidden tag was removed making the "Connect to the internet to add a
printer" string appear on the NFS settings page. This div should not
have existed on the NFS page in the first place (whoops), but it wasn't
showing up so no one noticed.

Bug: 968840
Change-Id: If3f4418be2789e47951da6a2e27e6621f4e9b07d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1637999
Auto-Submit: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665802}

chrome/browser/resources/settings/chromeos/os_downloads_page/smb_shares_page.html

@@ -19,9 +19,6 @@
         <a href="$i18n{smbSharesLearnMoreURL}" target="_blank">
           $i18n{learnMore}
         </a>
-        <div class="secondary">
-          $i18n{requireNetworkMessage}
-        </div>
       </div>
       <template is="dom-if" if="[[!prefs.network_file_shares.allowed.value]]"
           restamp>

chrome/browser/resources/settings/downloads_page/smb_shares_page.html

@@ -19,9 +19,6 @@
         <a href="$i18n{smbSharesLearnMoreURL}" target="_blank">
           $i18n{learnMore}
         </a>
-        <div class="secondary">
-          $i18n{requireNetworkMessage}
-        </div>
       </div>
       <template is="dom-if" if="[[!prefs.network_file_shares.allowed.value]]"
           restamp>