installer: Remove unused variable.
* gnu/installer/newt.scm (newt-run-command): Remove 'displayed-command'.
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			@ -117,10 +117,6 @@ report it by email to ~a.") uploaded-name %guix-bug-report-address)
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  (define (line-accumulator line)
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    (set! command-output
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          (string-append/shared command-output line "\n")))
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  (define displayed-command
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    (string-join
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     (map (lambda (s) (string-append "\"" s "\"")) args)
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     " "))
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  (define result (run-external-command-with-line-hooks (list line-accumulator)
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                                                       args))
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  (define exit-val (status:exit-val result))
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