[tbb-bugs] #29973 [Applications/Tor Browser]: Remove remaining stopOpenSecuritySettingsObserver() pieces

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#29973: Remove remaining stopOpenSecuritySettingsObserver() pieces
-------------------------------------+-------------------------------------
     Reporter:  gk                   |      Owner:  tbb-team
         Type:  defect               |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  ux-team,
     Severity:  Normal               |  GeorgKoppen201904,
                                     |  TorBrowserTeam201904, tbb-8.5-must-
                                     |  alpha
Actual Points:                       |  Parent ID:  #25658
       Points:                       |   Reviewer:
      Sponsor:                       |
-------------------------------------+-------------------------------------
 `stopOpenSecuritySettingsObserver()` is not needed anymore with the
 changes in #25658. However, there are some pieces left of it that result
 in a browser console error. Noted on our blog:
 https://blog.torproject.org/comment/280343#comment-280343

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29973>
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