[Bug Report] Windows, database_size field from get_info is 0
On Windows at least 10 & 11, the method "get_info" of the endpoint /json_rpc will always have a value of 0 on field "database_size".

To reproduce:

1. Start monerod without any args on a Windows system.
2. execute in cmd:
 `curl -d "{\"jsonrpc\":\"2.0\",\"id\":\"0\",\"method\":\"get_info\"}" http://127.0.0.1:18081/json_rpc`
3.  See the field "database_size"
`"database_size": 0,`