fix: txAdmin Heal Everyone functionality

[mafewtm]

Description

Fixes #94 though I feel these events might be exploitable

Checklist

• I have personally loaded this code into an updated Qbox project and checked all of its functionality.
• My pull request fits the contribution guidelines & code conventions.

[Manason]

How does changing this from a callback to an event fix txAdmin?

[mafewtm]

How does changing this from a callback to an event fix txAdmin?

Currently the event handler, txAdmin:events:healedPlayer passes an id which is either the player id or -1 and then passes that to the revivePlayer and heal functions. Inside these functions are the ox_lib callbacks which can't take -1 as a source. This then breaks the ability to heal everyone through txAdmin which why I've now changed it to events