Fix QNSPSA demo (#965)

Replace `op.adjoint()` with `qml.adjoint(op)`.
Got error about braket job name being taken, so changed name of job.

demonstrations/qnspsa.py

@@ -415,7 +415,6 @@ def get_state_overlap(tape):
 
 
 def get_raw_tensor_metric(params_curr):
-
     dir1 = get_perturbation_direction(params_curr)
     dir2 = get_perturbation_direction(params_curr)
     perturb1 = dir1 * finite_diff_step
@@ -874,7 +873,7 @@ def __get_overlap_tape(self, cost, params1, params2):
             for op in op_forward:
                 qml.apply(op)
             for op in reversed(op_inv):
-                op.adjoint()
+                qml.adjoint(copy(op))
             qml.probs(wires=cost.tape.wires.labels)
         return tape
 
@@ -980,7 +979,7 @@ def __apply_blocking(self, cost, params_curr, params_next):
     "spsa_repeats": 25,
 }
 
-job_name = f"ref-paper-benchmark-qubit-{n_qubits}"
+job_name = f"ref-paper-benchmark-qubit-{n_qubits}-job"
 instance_config = InstanceConfig(instanceType="ml.m5.large", volumeSizeInGb=30, instanceCount=1)
 
 job = AwsQuantumJob.create(