Fixed a Bluetooth Scanning issue.

+ When refreshing Bluetooth devices, sometimes it took awhile for some
devices to come back up.  This is a fix.

Bug: 17049458
Change-Id: Id6233b38585e003e0432707663af4d06b0ce98c2

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

@@ -230,10 +230,19 @@ public final class BluetoothSettings extends DeviceListPreferenceFragment implem
     }
 
     private void startScanning() {
-        if (isUiRestricted()) return;
+        if (isUiRestricted()) {
+            return;
+        }
+
         if (!mAvailableDevicesCategoryIsPresent) {
             getPreferenceScreen().addPreference(mAvailableDevicesCategory);
         }
+
+        if (mAvailableDevicesCategory != null) {
+            setDeviceListGroup(mAvailableDevicesCategory);
+            removeAllDevices();
+        }
+
         mLocalManager.getCachedDeviceManager().clearCachedDevices();
         mAvailableDevicesCategory.removeAll();
         mLocalAdapter.startScanning(true);