detect: reset signature groups when reversing flow

Ticket: 7552

When we use midstream, and the first packet we see of a flow is
a response from server, and we want to match on some signature
to client :
- we had first set sgh_toserver/FLOW_SGH_TOSERVER as we first
  thought this was a packet to server
- we then swap/reverse the flow, so sgh_toclient becomes sgh_toserver
  but it contains signatures to server and cannot match our
  to_client signature

The detect engine with DetectRunSetup will set again the
signatures group heads properly

src/app-layer.c

@@ -460,6 +460,8 @@ static int TCPProtoDetect(ThreadVars *tv, TcpReassemblyThreadCtx *ra_ctx,
                 SCLogDebug("reversing flow after proto detect told us so");
                 PacketSwap(p);
                 FlowSwap(f);
+                // Will reset signature groups in DetectRunSetup
+                f->de_ctx_version = UINT32_MAX;
                 SWAP_FLAGS(flags, STREAM_TOSERVER, STREAM_TOCLIENT);
                 if (*stream == &ssn->client) {
                     *stream = &ssn->server;