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The lastUntrustedBSSID variable was being used as an SSID, not a
BSSID, and was not cleared after the untrusted network was
disconnected, causing stats not to increment on new connections if the
last connection was to the same SSID.

So, remove this unnecessary variable, and check the current
WifiConfiguration to determine which network we're currently using, if
any. Increment the connection count only when we are actually going to
associate with the SSID.

This only affects untrusted network flows and should have no impact
when connecting to saved Wi-Fi networks. The only non-statistical
change involves the boost given to the active network, which is
controlled by the NetworkScorer and can be updated dynamically
(outside of the framework).

Bug: 18908655
Change-Id: I5b712a4ff613d8199d0591e568886be0d2419645