[3.9][plg_actionlogs] self activate account

[alikon]

Pull Request for Issue #29114 .

Summary of Changes

Different message when user self activate account

Testing Instructions

Turn on the registration on the site and the Self value for parameter New User Account Activation.
Register on the site with a real email address. Follow all instructions to activate your account.
Go to the User Actions Log section and pay attention to the lines.

Actual result BEFORE applying this Pull Request

2 identical messages

Expected result AFTER applying this Pull Request

[ChristineWk]

I have tested this item ✅ successfully on fe0501a

Checked (Actual result) erroneously on Joomla 4.0.0-dev5 before > Saw also there 2 identical messages.

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[joomlacorner]

I have tested this item success with pull request #30725

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[ChristineWk]

@joomlacorner In this case, mark it under "Test This" as successfully. Thanks

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[alikon]

RTC

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[HLeithner]

Thanks