try to make mister travis happy

app/src/test/java/nodomain/freeyourgadget/gadgetbridge/service/TestDeviceSupport.java

@@ -90,6 +90,11 @@ public class TestDeviceSupport extends AbstractDeviceSupport {
 
     }
 
+    @Override
+    public void onAppConfiguration(UUID appUuid, String config) {
+
+    }
+
     @Override
     public void onFetchActivityData() {