[sr-dev] [kamailio] dialog: wrong CSeq in BYE after PRACK (#409)

When using the dialog module to end a dialog, the remote UA refusing the BYE after a PRACK in the dialog.

``` ---- INVITE ( CSeq: 1 INVITE ) ---> <--- 100 ( CSeq: 1 INVITE ) ------- <--- 183 ( CSeq: 1 INVITE ) ------- ---- PRACK ( CSeq: 2 PRACK ) -----> <--- 200 OK ( CSeq: 2 PRACK ) ----- <--- 200 OK ( CSeq: 1 INVITE ) ---- ---- ACK ( CSeq: 1 ACK ) --------->

{ Mi: dlg.end_dlg() }

<--- BYE (CSeq: 1 BYE) BYE ( CSeq: 2 BYE) ----------> <--- 500 (Bad CSeq number) -------- ```

error in the remote log "remote cseq lower than previous ones - refusing request".

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