Fixed location autocomplete search

The S3LocationAutocompleteWidget widget in modules/s3/s3widget.py sends a function as a string to S3.autocomplete.generic in scripts/S3/s3.autocomplete.js

name_getter needs to be a function before it is called.

This was breaking the location autocomplete, which can be reproduced on the IFRC template on - http://127.0.0.1:8000/eden/project/project/1/location and clicking on "Add Community" and entering "Aileu Vila" in the Location field.