Fix HasTeams trait to be able to use queries with('currentTeam')

[r2luna]

When adding with('currentTeam') to an eloquent builder an error happens:

The issue is because the currentTeam method is checking if the user has current_team_id in order to set the default current_team_id based on the personal team. However, since the builder isn't a user itself, it always tries to perform this action.

Adding the check to see if the id is there, we will make sure that is a single user and not a query.