Invalid datakind for Monitor Connected Information in debug_print()

[mfncooper]

The AGWPE code for debug_print() uses the wrong datakind value for Monitor Connected Information in the TO_CLIENT switch statement.

https://github.com/wb2osz/direwolf/blob/dev/src/server.c#L382

The switch uses 'M' whereas the correct value should be 'I'.

This bug is the cause of the "**INVALID**" message types seen in the debug logs posted in issue #497.

[wb2osz]

Thank you for pointing out this issue.
This should be resolved in the "dev" branch.