RTMPT: Fix infinite loop

The RTMPT dissector when over TCP reuses the TCP sequence numbers, so
it needs to consider wraparound, which can occur both with the
tcp.relative_sequence_numbers preference set to FALSE, or in some
unusual cases (such as a SYN packet with a bogus sequence number so
that later packets overlap its sequence number.)

Change a sequence number comparison to use the wrap around aware
macros from packet-tcp.h Fix #17745.

(cherry picked from commit 32bb2a19)