Bluetooth : fix for crashing alertDialogbox

- changes for crashing of alertDialogbox while displaying message
- in showError function, this fix code shoud be added in case of showing error pop up

Bug: 5068089
Change-Id: I40e8a699461832b7bd47080b40f467572632d412
Signed-off-by: jhtop.kim <jhtop.kim@samsung.com>

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

@@ -79,6 +79,10 @@ public final class LocalBluetoothManager {
         return mContext;
     }
 
+    public Context getForegroundActivity() {
+        return mForegroundActivity;
+    }
+
     boolean isForegroundActivity() {
         return mForegroundActivity != null;
     }