Show bonded devices in "Pair new device"(2/2)

Some users forgot they had paired devices and couldn't see their BT device
when they search device in "Pair new device". (b/80382940, b/80133137).
Need to change the behavior to let paired devices can be shown on "Available devices".

Bug: 111738593
Test: Bluetooth Pairing Test
Change-Id: Ib499785abaa8e4efc1875be113ac87bdbe0c89ba

src/com/android/settings/bluetooth/DeviceListPreferenceFragment.java

@@ -192,6 +192,8 @@ public abstract class DeviceListPreferenceFragment extends
             preference = new BluetoothDevicePreference(getPrefContext(), cachedDevice,
                     mShowDevicesWithoutNames);
             preference.setKey(key);
+            //Set hideSecondTarget is true if it's bonded device.
+            preference.hideSecondTarget(true);
             mDeviceListGroup.addPreference(preference);
         } else {
             // Tell the preference it is being re-used in case there is new info in the