Fix shunt voltage control

[annetill]

Signed-off-by: Anne Tilloy anne.tilloy@rte-france.com

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What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

No SHUNT_B variable are created when the shunt controller is indeed deactivated after creation. For example, if we have already a voltage control at controlled bus or a transformer volatge control at controlled bus.

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