[mn-hooks.js] prettified defineRoutes method name

Change-Id: Iaf13861cbde33258fba6d8b5e0b4e731f08f521b
Reviewed-on: http://review.couchbase.org/41090
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Pavel Blagodov <stochmail@gmail.com>
Tested-by: Pavel Blagodov <stochmail@gmail.com>