Omit -toplevel.rexx from solution

[keiravillekode]

Each .meta/config.json solution previously mentioned a ...-toplevel.rexx file.

These are now omitted.

We also update each test entry to show ...-check.rexx

This change was generated using

find exercises/practice -name config.json -path  '*/.meta/*' -exec sh -c 'jq ".files.solution = [.files.solution[0]]" "$1" > "$1.tmp" && mv "$1.tmp" "$1"' _ {} \;

find exercises/practice -name config.json -path '*/.meta/*' -exec sh -c 'jq ".files.test = [.files.test[] | sub(\"^test-\"; \"\") + \"-check.rexx\"]" "$1" > "$1.tmp" && mv "$1.tmp" "$1"' _ {} \;

bin/configlet fmt -u

[keiravillekode]

Note that we could omit the reformatting by instead running

sed -i 's/\("solution": \["\([^"]*\)\.rexx"\), "[^"]*-toplevel\.rexx"\]/\1]/' exercises/practice/*/.meta/config.json

but note that bin/configlet fmt -u reapplies the reformatting.