Update replicate_db.j2

[zhuatuzilo]

add auto create db if not exists

[spetrosi]

I think this may cause troubles. E.g. if users do a typo in a database name in mssql_ha_db_names, the role will create and replicate an extra database.

README suggests to use mssql_pre_input_sql_file to pre-create a database if it doesn't exist. See https://github.com/linux-system-roles/mssql/blob/main/README.md?plain=1#L697-L700

The role should fail with an informative error message if a database provided in mssql_ha_db_names does not exist, saying that the database with this name doesn't exist and that you can create it e.g. with mssql_pre_input_sql_file.

[zhuatuzilo]

you are right，maybe it's just my personal need，and i will change this in my local