chore: use forge fmt --check to fail hook correctly (#247)

Author: varunsrin

.rusty-hook.toml

@@ -1,5 +1,5 @@
 [hooks]
-pre-commit = "forge fmt && forge snapshot --check --match-contract Gas && forge test -vvv"
+pre-commit = "forge fmt --check && forge snapshot --check --match-contract Gas && forge test -vvv"
 
 [logging]
 verbose = true