Merge branch 'fix-introduction-unit-tests' into 'master'

Fix IntroductionManager unit tests

I forgot to run the unit tests after changing the `GroupCount` serialization in response to a review comment. This MR fixes the tests.

See merge request !344

briar-tests/src/org/briarproject/introduction/IntroductionManagerImplTest.java

@@ -97,10 +97,12 @@ public class IntroductionManagerImplTest extends BriarTestCase {
 		);
 		metadataBefore = BdfDictionary.of(
 				new BdfEntry(GROUP_KEY_MSG_COUNT, 41L),
+				new BdfEntry(GROUP_KEY_UNREAD_COUNT, 0L),
 				new BdfEntry(GROUP_KEY_LATEST_MSG, 0L)
 		);
 		metadataAfter = BdfDictionary.of(
 				new BdfEntry(GROUP_KEY_MSG_COUNT, 42L),
+				new BdfEntry(GROUP_KEY_UNREAD_COUNT, 0L),
 				new BdfEntry(GROUP_KEY_LATEST_MSG, time)
 		);