[minor] The result counter does not update when filtering by folder

[ghost]

example of the above report:

• try https://transvision.mozfr.org/?recherche=top+sites&repo=aurora&sourcelocale=en-US&locale=fr&search_type=strings
  -> gives 9(en) + 3(fr) results
• now select folder "mobile"
  -> still displays 9 + 3 results though actual result is 2 + 0

[flodolo]

The number of results is generated server-side when you search, that's why it doesn't change when you filter (the filter actually hides the results belonging to other modules).

I agree that's a bit misleading, will need to check how hard it's to determine the number and replace it with JavaScript.