fix(rust/catalyst-voting): Added missing feature flag, updated conversion from `CtOption` to `Option` #349

Job	Run time
ci / discover	15s
ci / check / .+check-markdown	56s
ci / check / .+check-spelling	1m 5s
ci / check / ./rust+check	1m 9s
ci / check / ./rust+check-builder-src-cache	40s
ci / build / ./rust+build	3m 1s
ci / build / ./rust/c509-certificate+build-wasm	4m 32s
ci / build / ./rust/cbork+build	3m 2s
ci / package	0s
ci / test	0s
ci / publish	0s
ci / release	0s
ci / docs / ./docs+docs	46s
ci / final	3s
ci / deploy	0s
	15m 29s

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