Consider simplifying logic in reconcile loop for NAB.

[mpryc]

          Alright, what about keeping as it is, but simplify `if`s :question: 

	if reconcileExit || reconcileRequeue || reconcileErr != nil{
		return ctrl.Result{Requeue: reconcileRequeue, RequeueAfter: requeueTimeSeconds * time.Second}, reconcileErr
	}

Originally posted by @mateusoliveira43 in #54 (comment)

[mateusoliveira43]

Another places we need to change after today's discussion

• If only NAB Status is updated, predicate should not return true, which would re trigger Reconcile. This needs to be updated reflect fix: Update status design with NAR #70 to reflect what code will do after change is applied
• Only perform one update call per object (in this case, it is only NAB) per Reconcile, to avoid race conditions (the update call can update multiple things). This is being fixed in fix: add integration tests for NAB #73
• Remove NAB Spec change by Reconcile for now and evaluate later if we want that. This is being tracked here Do not allow Non Admin object backup spec change after Velero object is created #77