#1411 [typo] In Viewer dialog: "their" should be "theirs"

[john guin]

start VNC viewer
connect to a device that does not have a supported security type (RPi 3)

Result:
Server sent security types, but we do not support any of their.

Expect:
Server sent security types, but we do not support any of theirs. <<<or>>>
Server sent security types, but we do not support any of them.</or>

This is in RemoteViewerCore.cpp in
int RemoteViewerCore::selectSecurityType(const vector<uint32> secTypes,
const map<uint32, authhandler="" *=""> </uint32,>authHandlers) const
...</uint32>

throw Exception(_T("No security types supported. ")
_T("Server sent security types, ")
_T("but we do not support any of their."));