Merge branch 'progressbar-remove-contact' into 'master'

Show progress bar while removing contact

See merge request briar/briar!1759

briar-android/src/main/java/org/briarproject/briar/android/conversation/ConversationActivity.java

@@ -925,6 +925,7 @@ public class ConversationActivity extends BriarActivity
 	}
 
 	private void removeContact() {
+		list.showProgressBar();
 		runOnDbThread(() -> {
 			try {
 				contactManager.removeContact(contactId);