(bankruptcy court determined that lessors’ letter stating that “as a result of your material breach,” we have “voted to terminate” your lease was not a proper termination of a lease for a Christmas tree farm; under VA law, lessors were required to make an actual demand for payment of past due amounts before the lease could be terminated; forfeitures were never favored in law, and to enforce a forfeiture without a prior demand would be “grossly inequitable”).