Widgets - add default constraint that uses > or <

@rachellyne wants to add a default constraint on the flyatlas widget:

```

```

The constraints value doesn't work. I tried `presentCall != 2` as well and that didn't work. Here's the error:

```
Invalid JSON Response for flyatlas_for_gene
error is false; was expecting Null but got Could not find a graph widget called "flyatlas_for_gene"
statusCode is false; was expecting HTTP code 200 but got 404
```

Tell @rachellyne