BUG: Broken Debounce on WordCamp Attendance UI

[dryanpress]

The Camptix Attendance UI for WordCamp.org offers a search box that offers results as you type. The current debouncer unfortunately doesn't work, causing an Admin AJAX call for each typed character.

In Short, the wordcamp.org server could receive hundreds or thousands of requests-per-minute during a busy camp check in.

I've relocated the debounce function and lightly reduced the debounce timeout from 500 to 350ms so that check-in search still feels equally fast, but isn't slamming the server with requests.

[Otto42]

Through testing on an old WC site, I can confirm that the debounce for the search there doesn't work properly. Haven't tested this fix yet, but that is indeed the correct place to fix the problem.

[coreymckrill]

In 7454:

CampTix Attendance: Fix debounce on search input

Relocates the debounce call for the search function so that it works
correctly, preventing a new Ajax request from firing on every keystroke
in the search box in the Attendance UI.

Fixes #3711
Props dryanpress