Fix save file extension on Windows #313

Job	Run time
lint:fmt (wallet-proxy-load-simulator/Cargo.toml)	14s
lint:fmt (state-compare/Cargo.toml)	12s
lint:fmt (genesis-creator/Cargo.toml)	14s
lint:fmt (id-verifier/Cargo.toml)	16s
lint:fmt (kpi-tracker/Cargo.toml)	13s
lint:fmt (network-dashboard-proxy/Cargo.toml)	14s
lint:fmt (chain-prometheus-exporter/Cargo.toml)	12s
lint:fmt (recover-id-object/Cargo.toml)	14s
lint:fmt (generator/Cargo.toml)	14s
lint:fmt (wallet-connect-test-bench/smart-contract/Cargo.toml)	11s
lint:clippy (wallet-proxy-load-simulator/Cargo.toml)	38s
lint:clippy (state-compare/Cargo.toml)	1m 15s
lint:clippy (genesis-creator/Cargo.toml)	1m 19s
lint:clippy (id-verifier/Cargo.toml)	1m 20s
lint:clippy (kpi-tracker/Cargo.toml)	1m 21s
lint:clippy (network-dashboard-proxy/Cargo.toml)	1m 14s
lint:clippy (chain-prometheus-exporter/Cargo.toml)	1m 54s
lint:clippy (recover-id-object/Cargo.toml)	1m 19s
lint:clippy (generator/Cargo.toml)	1m 16s
lint:clippy (wallet-connect-test-bench/smart-contract/Cargo.toml)	27s
	14m 17s

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