[tor-bugs] #34301 [Applications/Tor Browser]: Fix shellcheck issues in our tor-browser-build scripts

[Tor Bug Tracker & Wiki]

#34301: Fix shellcheck issues in our tor-browser-build scripts
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     Reporter:  gk                        |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-rbm, tbb-maint
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 We add more and more shell scripts for different tasks into our `tor-
 browser-build` repo, which is great. We should go over the already
 existing ones and fix `shellcheck` issues.

 This is the parent ticket for that effort.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34301>
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