[thread-helper] update `otDatasetSetActive()` use now being `void` #160

Job	Run time
Border Router (mDNSResponder)	28m 39s
Border Router (Avahi)	28m 44s
Border Router TREL (mDNSResponder)	27m 31s
Border Router TREL (Avahi)	27m 56s
Border Router MATN (mDNSResponder)	17m 17s
Border Router NAT64 (mDNSResponder)	22m 54s
Backbone Router	17m 15s
Border Router TREL with FEATURE_FLAG (avahi)	27m 52s
	3h 18m 8s

Provide feedback