[FIX] fixes searchbar navigation (web client)

the code handling the keydown events was moved, but the variable this
was not adjusted accordingly, resulting in a broken navigation.

It is now possible to press LEFT and RIGHT again to move the focus
between facets.
Merge pull request #648 from odoo-dev/7.0-fix-searchbar-navigation-ged

[FIX] fixes searchbar navigation (web client)