Fix for dynamic methods defined as [class, method]

[mjauvin]

The following breaks HasRelationships concern:

$model->addDynamicMethod('myMethod', [static::class, 'myMethod']);

[bennothommo]

@mjauvin we will need a unit test to determine that a relation defined in the array callback format can be detected as a relation - your tests so far only seem to be "failure" states.

[mjauvin]

Yes, the tests so far are there to trigger the case that was failing before I made the PR.

[mjauvin]

@mjauvin we will need a unit test to determine that a relation defined in the array callback format can be detected as a relation - your tests so far only seem to be "failure" states.

Done!