Fix Passpoint network details privacy and ssid

Allow changing the privacy setting for Passpoint networks, which are
considered subscriptions but not saved networks. Also use getSsid() for
the SSID pref.

Bug: 70983952
Test: manual build and visual verification
Change-Id: I8a4309421b28bccaf2bd62a23dca8cef133d5af1

src/com/android/settings/wifi/details2/WifiDetailPreferenceController2.java

@@ -623,9 +623,9 @@ public class WifiDetailPreferenceController2 extends AbstractPreferenceControlle
     }
 
     private void refreshSsid() {
-        if (mWifiEntry.isSubscription()) {
+        if (mWifiEntry.isSubscription() && mWifiEntry.getSsid() != null) {
             mSsidPref.setVisible(true);
-            mSsidPref.setSummary(mWifiEntry.getTitle());
+            mSsidPref.setSummary(mWifiEntry.getSsid());
         } else {
             mSsidPref.setVisible(false);
         }