### Description
Chaining the transformations {uri.param,received} and {uri.host} does not work
if the address is IPv6. It works for IPv4 addresses.
#### Reproduction
We tested this with the following code:
```
if ($du != $null) {
$var(received_uri)=$(du{uri.param,received});
if ($var(received_uri)!="") {
$var(subscriber_host)=$(var(received_uri){uri.host});
}
$var(test_tmp)=$(du{uri.param,received}{uri.host});
xlog("L_ERR", "WURST subscriber_host=$var(subscriber_host)
test_tmp=$var(test_tmp) du=$du received_uri=$var(received_uri)");
}
}
#### Log Messages
For IPv6 this gives us:
```
"module": "pv", "file": "pv_trans.c", "line": 1545, "function": "tr_eval_uri",
"logprefix": ", "callid": "1-91@1.2.4.16", "x-telco-capture-id": "<null>"",
"message": **"invalid uri [ab:cdef:dead:beef]:1234]\n"**
"module": "core", "file": "core/lvalue.c", "line": 351, "function":
"lval_pvar_assign", "logprefix": ", "callid": "1-91@1.2.4.16",
"x-telco-capture-id": "<null>"", "message": "non existing right pvar\n"
"module": "core", "file": "core/lvalue.c", "line": 411, "function":
"lval_assign", "logprefix": ", "callid": "1-91@1.2.4.16", "x-telco-capture-id":
"<null>"", "message": "assignment failed at pos: (1432,19-1432,53)\n"
"module": "xlog", "file": "xlog.c", "line": 278, "function": "", "logprefix":
", "callid": "1-91@1.2.4.16", "x-telco-capture-id": "<null>"", "message":
"WURST subscriber_host=[2001:db8:0123:4567:89ab:cdef:dead:beef] test_tmp=0
du=sip:1.2.4.129;lr;received=sip[2001:db8:0123:4567:89ab:cdef:dead:beef]:1234
received_uri=sip:[2001:db8:0123:4567:89ab:cdef:dead:beef]:1234"
"module": "xlog", "file": "xlog.c", "line": 278, "function": "", "logprefix":
", "callid": "1-91@1.2.4.16", "x-telco-capture-id": "<null>"", "message":
"determineSubscribeIpFamily: contacts worked path=0
ip=[2001:db8:0123:4567:89ab:cdef:dead:beef] af=6"
```
For IPv4 it works:
`{ "idx": 8, "pid": 577, "level": "ERROR", "module": "xlog", "file": "xlog.c",
"line": 278, "function": "", "logprefix": ", "callid": "1-91@1.2.4.16",
"x-telco-capture-id": "<null>"", "message": "WURST subscriber_host=12.34.56.78
test_tmp=12.34.56.78 du=sip:1.2.4.149;lr;received=sip:12.34.56.78:1234
received_uri=sip:12.34.56.78:1234" }
`
--
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https://github.com/kamailio/kamailio/issues/3794
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