fix possible fallthrough.

src/eu/siacs/conversations/ui/ConversationFragment.java

@@ -399,6 +399,7 @@ public class ConversationFragment extends Fragment {
 			return true;
 		case R.id.download_image:
 			downloadImage(selectedMessage);
+			return true;
 		default:
 			return super.onContextItemSelected(item);
 		}

src/eu/siacs/conversations/ui/ManageAccountActivity.java

@@ -123,6 +123,7 @@ public class ManageAccountActivity extends XmppActivity {
 			return true;
 		case R.id.mgmt_account_announce_pgp:
 			publishOpenPGPPublicKey(selectedAccount);
+			return true;
 		default:
 			return super.onContextItemSelected(item);
 		}