Skip showing user unified folders

app/src/main/java/eu/faircode/email/AdapterNavUnified.java

@@ -227,6 +227,8 @@ public class AdapterNavUnified extends RecyclerView.Adapter<AdapterNavUnified.Vi
         TupleFolderUnified unified = new TupleFolderUnified();
         for (TupleFolderUnified type : new ArrayList<>(folders)) {
             TupleFolderUnified f = map.get(type.type);
+            if (!EntityFolder.SYSTEM.equals(type.type) &&
+                    !EntityFolder.USER.equals(type.type))
                 if (f == null)
                     map.put(type.type, type);
                 else {