Fix disable auditing before model initialization

[evgeek]

The Auditable::bootAuditable() trait loader on the model works only once, at the very first initialization of the class. Thus, at the moment, if auditing is disabled on the model during initialization, an observer will not be booted on the model, and a further call to Model::enableAudit() will not change anything - there is no observer, no events are registered.

The itDisablesAndEnablesAuditingBackAgain test skipped this behavior because the model was first initialized before auditing was disabled.

I suggest init observer on the model, regardless of the $auditingDisabled flag. I made the appropriate changes, and the itDisablesAndEnablesAuditingBackAgainViaFacade test, where auditing is disabled before initialization.

[anteriovieira]

@parallels999 @erikn69 @MortenDHansen any comments here?

[erikn69]

Makes a lot of sense to me, this would only happen in this specific case, it makes me think that no one has ever used disableAuditing() in that way before.

So bootAuditable from Model A class is called once after disableAuditing() and after enableAuditing() the same Model A stops auditing because there is no observer