Fix snaphot fn after metadata update #937

Job	Run time
set-image	1s
Check documentation	2m 37s
Clippy	4m 50s
Check code	3m 34s
Build polkadot-staking-miner binary	4m 35s
Check formatting	1m 2s
Run tests	7m 30s
Test Docker image build	27s
Build and publish Docker image	0s
	24m 36s

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