Remove redundant maxReconnects database connection property

'maxReconnects' only applies if 'autoReconnect' is set to true and setting it to 0 throws an SQLException as 0 is not a valid value in more recent versions of MySQL Connector/J, specifically:

```
[21:04:41 INFO]: [mcMMO] Attempting connection to MySQL...
[21:04:41 ERROR]: [mcMMO] Connection to MySQL failed!
[21:04:41 ERROR]: [mcMMO] SQLException: The connection property 'maxReconnects' only accepts integer values in the range of 1 - 2147483647, the value '0' exceeds this range.
[21:04:41 ERROR]: [mcMMO] SQLState: S1009
[21:04:41 ERROR]: [mcMMO] VendorError: 0
```