I have always found the :pistol: -> water gun thing to be a great example of corporate NewSpeak in the service of some ideology.
If you mean a pistol, it should be a pistol.
If you mean a water gun, it should be a water gun.
Having both icons seems perfectly fine.
So I rather like this change: it reverts a Newspeakism back to normal meaning. Also, as another commentator points out, the relevant Unicode symbol definition image is an actual pistol.
anyway, a bit of a molehill to get riled up about. I have a mountain of code to climb. Ta!