[Bug]: set logFilename in system_vars_config.toml doesn't work

[dengn]

Is there an existing issue for the same bug?

• [X] I have checked the existing issues.

Environment

- Version or commit-id (e.g. v0.1.0 or 8b23a93):89ec9341cafb1a5a8c638165fbb54cf4ce757ded
- Hardware parameters: 4C 16G
- OS type: CentOS
- Others:

Actual Behavior

Set logFilename record in system_vars_config.toml before starting mo-server:

Starting mo-server gets an error: [root@VM-0-8-centos matrixone]# 2022/07/20 10:41:38.311728 +0800 INFO db-server/main.go:163 Load config error:update parameter logFilename failed.error:setLogFilename,the value mo.log is not in set []

Expected Behavior

No response

Steps to Reproduce

No response

Additional information

No response