monitor.cpp does not fflush to stdout

[rlica]

We encountered a problem when trying to write the stdout of monitor.cpp to a text file, in order to have the rate in a txt file that we can further monitor (using Grafana).

The fix was easy, at line 259 in monitor.cpp added: " fflush(stdout); "

Can be implemented in the branch?

[tking53]

@rlica Just wanted to let you know that we haven't forgotten this. we are just very busy with FDSi.