[23.1] Fix missing grep input in sort1 tool

[mvdbeek]

Cherry-picked out of #15229

How to test the changes?

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• I've included appropriate automated tests.
• This is a refactoring of components with existing test coverage.
• Instructions for manual testing are as follows:
  1. [add testing steps and prerequisites here if you didn't write automated tests covering all your changes]

License

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[bernt-matthias]

Looks good to me.

If you have an idea how to get tools that are listed in any of the tool conf files tested (and maybe even lined).. Then please comment in the linked PR

[mvdbeek]

I don't know that we should test or update the tools except for blatant bugs like this one, which you can just planemo test.