[tor-bugs] #33402 [Applications/Tor Browser]: Set app.update.url for nightly builds

[Tor Bug Tracker & Wiki]

#33402: Set app.update.url for nightly builds
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     Reporter:  boklm                |      Owner:  boklm
         Type:  task                 |     Status:  assigned
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-rbm, tbb-update,
     Severity:  Normal               |  TorBrowserTeam202002
Actual Points:                       |  Parent ID:  #18867
       Points:  .1                   |   Reviewer:
      Sponsor:                       |
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 We won't use the same `app.update.url` for releases and nightly builds. So
 we need to change this pref in the nightly builds.

 https://nightlies.tbb.torproject.org/nightly-updates/updates/ is where the
 updates xml for nightly builds are located.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33402>
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