[libratest] Fix launch_swarm in throughput test.
[libratest] Fix launch_swarm in throughput test.

Summary:
Add the missed template_path argument.

Test Plan:
cargo test --release -p testsuite -- --nocapture

Signed-off-by: Jiaqi Yan <fce1e3ca945966fe382296ec5e7abbbe396a964f@calibra.com>

libra/libra,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,libra/libra,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core