Show all devices, including connected ones, into "Previously connected" page

-Add connected devices in "Previously connected" page
-Set active when clicking a connected device

Bug: 147150246
Test: make -j50 RunSettingsRoboTests
Change-Id: I4422cd63c360a4387cedc4f80f34474b42f82a1f

tests/robotests/src/com/android/settings/bluetooth/SavedBluetoothDeviceUpdaterTest.java

@@ -144,6 +144,15 @@ public class SavedBluetoothDeviceUpdaterTest {
         verify(mCachedBluetoothDevice).connect();
     }
 
+    @Test
+    public void onClick_Preference_connected_setActive() {
+        when(mCachedBluetoothDevice.isConnected()).thenReturn(true);
+
+        mBluetoothDeviceUpdater.onPreferenceClick(mPreference);
+
+        verify(mCachedBluetoothDevice).setActive();
+    }
+
     @Test
     public void forceUpdate_findCachedBluetoothDeviceIsMatched_addPreference() {
         final List<BluetoothDevice> bluetoothDevices = new ArrayList<>();