Update the configuration variable for MinIdleConns

[ghost]

What happened: The config variable that is defined in the service.yaml file for setting the minIdleConns of the redis client has not been renamed when the code was refactor a while back. It should say redis_min_idle_conns instead of redis_max_idle.

What you expected to happen: Right variable name in the yaml file.

How to reproduce it (as minimally and precisely as possible): Not a bug, simply confusing when configuring the service.

Anything else we need to know?:

Environment:

• Open Saves version: latest
• Kubernetes version (use kubectl version): N/A
• Cloud provider or hardware configuration: N/A
• Install method (yaml/helm): N/A
• Troubleshooting guide log(s): N/A
• Others: N/A