Use getTitle() for AccessPoint display name

Instead of getSsidStr(), AccessPoint display names should use
getTitle() to accomodate Passpoint networks which use a provider
name instead of a single ssid. This change allows the provider
name to be displayed in the network details page, the long
press wifi dialog, and the config editing dialog.

Bug: 118705403
Test: atest WifiSettingsTest
Change-Id: I930d6218c7e464ad20c0c61130e0cb9ce315d9a2

src/com/android/settings/wifi/WifiSettings.java

@@ -483,7 +483,7 @@ public class WifiSettings extends RestrictedSettingsFragment
         if (preference instanceof LongPressAccessPointPreference) {
             mSelectedAccessPoint =
                     ((LongPressAccessPointPreference) preference).getAccessPoint();
-            menu.setHeaderTitle(mSelectedAccessPoint.getSsid());
+            menu.setHeaderTitle(mSelectedAccessPoint.getTitle());
             if (mSelectedAccessPoint.isConnectable()) {
                 menu.add(Menu.NONE, MENU_ID_CONNECT, 0, R.string.wifi_menu_connect);
             }