Reset LastUpdate on neuron replace #314

Job	Run time
typescript-formatting	1m 4s
build (release)	14m 15s
build (fast, --features fast-runtime)	16m 24s
typescript-e2e-zombienet_staking	12m 29s
typescript-e2e-dev	58s
typescript-e2e-zombienet_shield	18m 8s
typescript-e2e-zombienet_coldkey_swap	6m 22s
	1h 9m 40s

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