Bump search_autocomplete_count default from 10 to 15

[colemanw]

Overview

Improves the overall responsiveness of Autocompletes by fetching more results at a time.

Before

Ajax requests can be slow.

After

Fetching 50% more will add a negligible amount of time to each request, but cut down on the number of requests.

Comments

Bikesheddy question of whether it should be 15 or 20 but I think it's safe to say that 10 is too few so at least this is better.

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[eileenmcnaughton]

OK - makes sense