Remove special handling of some TCP flows without SYN (#1965)

This piece of code has multiple problems:
* nDPI is able to detect some TCP protocols even with mid-flows (i.e.
without the initial packets of the session); TLS is the most
significative example
* since e6b332aa4a1399e33df68998cf8351bccaee3fc4 it is perfectly valid
to not pass the TCP Handshake packets to nDPI
* in any case, we shouldn't call `ndpi_detection_giveup()`. That
function is usually called by the application and we end up calling it
twice in some cases.

The simple solution is to completely remove that code: process these
kinds of flows like everyone else.

Note that the application can always avoid to pass to nDPI any TCP flows
without the initial handshake; the flow managemnt is always up to the
application.

Looking at the CI results, some rare flows are now processed significantly
longer. As a follow-up we could look into that.

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