FIX: fix dynamic partition replicationNum error

[stalary]

Proposed changes

dynamic_partition.replication_num default is replication_num, but show create table show -1

Types of changes

What types of changes does your code introduce to Doris?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• [] New feature (non-breaking change which adds functionality)
• [] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [] Documentation Update (if none of the other choices apply)
• [] Code refactor (Modify the code structure, format the code, etc...)

Further comments

replace DynamicPartitionProperty toString with getProperties

[stalary]

The previous branch did not work properly, so I recreated PR. @morningman

[morningman]

LGTM