bug#40442: srt2vtt does not work

[sirgazil]

I installed srt2vtt but it errors when I run it.


## Steps to reproduce

1. Run "guix install srt2vtt"
2. Run "srt2vtt --help"


## Expected result

I can see the help information indicated in srt2vtt's website:

$ srt2vtt --help
Usage: srt2vtt [OPTIONS]
Convert SubRip formatted subtitles to WebVTT format.

  -h, --help             display this help and exit
  -v, --version          display version and exit
  -i, --input=FILE-NAME  read input from FILE-NAME
  -o, --output=FILE-NAME write output to FILE-NAME


## Unexpected result

$ srt2vtt --help
Backtrace:
In ice-9/boot-9.scm:
 160: 17 [catch #t #<catch-closure 7f2f5517b2e0> ...]
In unknown file:
   ?: 16 [apply-smob/1 #<catch-closure 7f2f5517b2e0>]
In ice-9/boot-9.scm:
  66: 15 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
 432: 14 [eval # #]
In ice-9/boot-9.scm:
2412: 13 [save-module-excursion #<procedure 7f2f5519e900 at 
ice-9/boot-9.scm:4084:3 ()>]
4089: 12 [#<procedure 7f2f5519e900 at ice-9/boot-9.scm:4084:3 ()>]
1734: 11 [%start-stack load-stack ...]
1739: 10 [#<procedure 7f2f551b1b70 ()>]
In unknown file:
   ?: 9 [primitive-load "/home/sirgazil/.guix-profile/bin/srt2vtt"]
In ice-9/eval.scm:
 505: 8 [#<procedure 7f2f553ae660 at ice-9/eval.scm:499:4 (exp)> (use-modules # 
#)]
In ice-9/psyntax.scm:
1107: 7 [expand-top-sequence ((use-modules (ice-9 match) (srt2vtt ui))) () ...]
 990: 6 [scan ((use-modules (ice-9 match) (srt2vtt ui))) () ...]
 279: 5 [scan ((# #) #(syntax-object *unspecified* # #)) () (()) ...]
In ice-9/boot-9.scm:
3622: 4 [process-use-modules (((ice-9 match)) ((srt2vtt ui)))]
 710: 3 [map #<procedure 7f2f5523caa0 at ice-9/boot-9.scm:3622:25 (mif-args)> 
(# #)]
3623: 2 [#<procedure 7f2f5523caa0 at ice-9/boot-9.scm:3622:25 (mif-args)> (#)]
2903: 1 [resolve-interface (srt2vtt ui) #:select ...]
In unknown file:
   ?: 0 [scm-error misc-error #f "~A ~S" ("no code for module" (srt2vtt ui)) #f]

ERROR: In procedure scm-error:
ERROR: no code for module (srt2vtt ui)


## System information

$ guix describe
Generation 70   Apr 02 2020 08:07:55    (current)
  sirgazil-x 66d4b67
    repository URL: https://gitlab.com/sirgazil/guix-channel-x.git
    branch: master
    commit: 66d4b677875c84d0b7a946376cd4885f202094eb
  guix 725862e
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: 725862ef53687c77ea08aa837436d14747839c41


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