In some cases, the network connection UI uses pango markup to denote the
SSID name inside a connection name. However, if the SSID matched the
connection name, then we would end up setting the SSID as pango markup
without it being escaped.
Fix this by escaping the SSID before setting it as markup.
Fixes: #435
Note that this also changes the way to detect that the connection is
currently active. This change is not required but but does simplify the
code a little bit.
In almost all cases, the SSID will be identical with the connection name
(in fact, we do not even allow modifying the connection name). However,
as it is now, we can end up with multiple connections with the same name
in the list.
Change the list to indicate the SSID separately in a way that will not
result in any changes in the usual case.
