Geo filters applied but not added to the kuery string

[Bargs]

Kibana version: master, 6.0-beta1

Elasticsearch version: master, 6.0-beta1

Description of the problem including expected versus actual behavior:

When creating a geo_bounding_box filter via the tilemap UI, the data gets filtered but the kuery string in the query bar is not updated.

Steps to reproduce:

1. Selected Kuery mode in the query bar
2. Create a tilemap vis
3. Create a geo bounding box filter
4. Observe the lack of change in the query bar

Not sure if this should be a blocker or not, but I'll add the label for now. I assume it'll be a simple fix, this definitely used to work. I'll look into it first thing tomorrow.

[bhavyarm]

Reproduced this on BC4 of beta!