remove config

Author: jeffrymsft

common/src/androidTest/java/com/microsoft/identity/common/internal/platform/AndroidDevicePoPManagerEncryptionTests.java

@@ -52,7 +52,6 @@
 // https://github.com/robolectric/robolectric/issues/1518
 //todo: Investigate if these tests can be migrated to common4j
 @RunWith(Parameterized.class)
-@Config(sdk =21)
 public class AndroidDevicePoPManagerEncryptionTests {
 
     private static final String DATA_TO_ENCRYPT = "The quick brown fox jumped over the lazy dog.";