daemon-grpc: fix return value in the GetTransaction RPC

As specified in the .proto file, return `grpc::StatusCode::NOT_FOUND`
when the Transaction ID isn't found in the rollback log.

Signed-off-by: Renato Westphal <[email protected]>

holo-daemon/src/northbound/client/grpc.rs

@@ -360,7 +360,7 @@ impl From<northbound::Error> for Status {
                 Status::resource_exhausted(error.to_string())
             }
             northbound::Error::TransactionIdNotFound(..) => {
-                Status::invalid_argument(error.to_string())
+                Status::not_found(error.to_string())
             }
             northbound::Error::Get(..) => {
                 Status::invalid_argument(error.to_string())