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Fix for https://github.com/Qiskit/qiskit-aer/issues/2235 #2239

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AerState::probability and AerState::amplitude calls for a MPS simulator return the wrong ordering for states

Summary

The MPS simulator returned the wrong states amplitudes and probabilities with AerState::probability and AerState::amplitude calls.

Details and comments

The values were correct, but for the wrong states, the reason being the order of qubits.
The fix is by adding a function reorder_qubits_rev that provides the correct order of qubits and by modifying MPS::get_amplitude_vector to call it instead of the original call to reorder_qubits.

More details on the issue description and in the comments: #2235

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