runtests: fix output to command log

- Record only the command of the most recently ran test in the command
  log.

This is a follow-up to 02988b7 from several weeks ago which fixed
writing to the command log, however it saved all commands for all tests
instead of just the most recently ran test as we would now expect.

Fixes https://github.com/curl/curl/commit/02988b7#commitcomment-37546876
Closes https://github.com/curl/curl/pull/5001

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