io_queue: Don't re-initialize default multipliers
io_queue: Don't re-initialize default multipliers

The config's multipliers have default initializers, there's no
need to initialize them by hands.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@scylladb.com>

scylladb/seastar,cloudius-systems/seastar,avikivity/seastar,avikivity/seastar,scylladb/seastar,syuu1228/seastar,cloudius-systems/seastar,scylladb/seastar,avikivity/seastar,syuu1228/seastar,cloudius-systems/seastar,syuu1228/seastar