[sr-dev] [kamailio/kamailio] cancel_branch("this") not working (#1620)

[arheops]

Need add 
_tmx_tmb.prepare_to_cancel(t, &cancel_data.cancel_bitmap, 0);

into function static int t_cancel_branches_helper(sip_msg_t* msg, int n)

at case of 2( "this")

proposed changes:
```

                case 2:
                        /* prepare cancel for current branch (idx) */
                        if(msg->first_line.u.reply.statuscode>=200)
                                break;
                        cancel_data.cancel_bitmap = 1<<idx;
+                        _tmx_tmb.prepare_to_cancel(t, &cancel_data.cancel_bitmap, 0);
                        break;
```

### Additional Information

kamailio version 4.* to 5.*

```
```

Without this it can't cancel "this" transaction.

Rare case due to low use of "this".


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