[tbb-bugs] #26186 [Applications/Tor Browser]: Replace usage of `intl.locale.matchOS` in tor-browser's build script

[Tor Bug Tracker & Wiki]

#26186: Replace usage of `intl.locale.matchOS` in tor-browser's build script
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     Reporter:  gk                        |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  ff60-esr
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 `intl.locale.matchOS` is not anymore (see the respective Torbutton change
 in #26100), we need to replace it in tor-browser's build script.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26186>
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