[tor-bugs] #31550 [Applications/Tor Browser]: Fix shellcheck (and related) issues in start-tor-browser

[Tor Bug Tracker & Wiki]

#31550: Fix shellcheck (and related) issues in start-tor-browser
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     Reporter:  nickm                     |      Owner:  nickm
         Type:  enhancement               |     Status:  assigned
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 I got a warning when I was running the script, so I ran shellcheck on it
 and got a bunch of warnings.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31550>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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