[Messages] Fix bug where DoT messages stop coming out when mob dies.

[noudess]

Description

My old PR #2289 accidentally removed messages for DoTs that are cast by NPCs on PCs after the NPC dies.

On live:

We now match this.

Additionally I created an issue #4248 because its always been true on live that DoTs live past the corpse. That change on eqemu is larger in scale and I think should be separate from this PR. On live, the damage still occurs and looks like this:

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Testing

Killed a mob after getting DoTTed and made sure damage was getting done and we got the messages again.

Clients tested: RoF2

Checklist

• I have tested my changes
• I have performed a self-review of my code. Ensuring variables, functions and methods are named in a human-readable way, comments are added only where naming of variables, functions and methods can't give enough context.
• I own the changes of my code and take responsibility for the potential issues that occur