Events - Make player muzzle event args consistent for retro

[PabstMirror]

Fix #1363

playerEvent.sqf does (just the 2 muzzles, no unit)

    if (_newMuzzle isNotEqualTo GVAR(oldMuzzle)) then {
        [QGVAR(muzzleEvent), [_newMuzzle select 2, GVAR(oldMuzzle) select 2]] call CBA_fnc_localEvent;

We need to make the two args arrays the same, and I think it's much safer to modify the retro one

[commy2]

I don't like this. It should pass unit-newMuzzle-oldMuzzle.

[PabstMirror]

I agree it probably should have, but I think changing it now can break a lot more than this
This just changes the "retro" args which are called at most 0 to 1 times.
The playerEvent loop would be called much more often.

IE, code written for the muzzle EH is going to be expecting [newMuzzle, oldMuzzle]