'make test': Fix breakage introduced by 4d3da30f8b:
test failure would not be reflected by the exit code of 'make'. Setting a shell parameter in the left-hand side of a pipe is not visible to commands after the pipe, because the left-hand side forks. (That's true both in 'sh' used by 'make' and in 'zsh' that runs tests/test-highlighting.zsh, at least on my system.) Therefore, move the colorizing hook to where it doesn't interfere with setting the $something_failed (in tests/test-highlighting.zsh) and $result (in Makefile) parameters.
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