[tahoe-lafs-trac-stream] [Tahoe-LAFS] #4048: Fix the `cli_options.stdout` pattern

[Tahoe-LAFS]

#4048: Fix the `cli_options.stdout` pattern
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     Reporter:  exarkun  |      Owner:
         Type:  defect   |     Status:  new
     Priority:  normal   |  Milestone:  undecided
    Component:  unknown  |    Version:  n/a
   Resolution:           |   Keywords:
Launchpad Bug:           |
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Comment (by exarkun):

 Also, this "add a stdout/stderr" pattern appears elsewhere - but in places
 mypy isn't checking yet.

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Ticket URL: <https://tahoe-lafs.org/trac/tahoe-lafs/ticket/4048#comment:1>
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