bug#68401: 30.0.50; ERC 5.6-git: `erc-cmd-GMSG', `erc-cmd-AMSG', `erc-cmd-GME', `erc-cmd-AME'. 2nd attempt

> Well, trivial or not, the code looks _much_ better now so
> those small changes really worked.

The unit test worked with the new code as well, sweet.

Now everything should be done, right?

As a side note, touching upon the unit test, to not have to
remove the log file manually with a filepath, you can do

  $ make -C test mostlyclean

instead. 

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