Fixed a memory leak in the bluetooth settings

Release resources in onPause rather than onResume to fix a memory leak.
Without this fix the app will crash if you are in Bluetooth settings
and tap "Device name" and then roate the device a few times.

Change-Id: I57a8346247c13f5113e7c4ea39dde5b29a7359bb

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

@@ -161,8 +161,6 @@ public class BluetoothSettings extends PreferenceActivity
 
         // Repopulate (which isn't too bad since it's cached in the settings
         // bluetooth manager
-        mDevicePreferenceMap.clear();
-        mDeviceList.removeAll();
         addDevices();
 
         if (mScreenType == SCREEN_TYPE_SETTINGS) {
@@ -187,6 +185,9 @@ public class BluetoothSettings extends PreferenceActivity
     protected void onPause() {
         super.onPause();
 
+        mDevicePreferenceMap.clear();
+        mDeviceList.removeAll();
+
         mLocalManager.setForegroundActivity(null);
         mDevicePreferenceMap.clear();
         mDeviceList.removeAll();