Fix wxIPV6address initialization

Use DoInitImpl() which, somehow, was never used before, meaning that,
apparently, wxIPV6address never worked at all, as objects of this type
were still initialized to use FAMILY_INET (i.e. IPv4 address family).

Closes #22463.

src/common/sckaddr.cpp

@@ -796,7 +796,7 @@ void wxSockAddress::Clear()
 wxSockAddressImpl& wxIPaddress::GetImpl()
 {
     if ( m_impl->GetFamily() == wxSockAddressImpl::FAMILY_UNSPEC )
-        m_impl->CreateINET();
+        DoInitImpl();
 
     return *m_impl;
 }