kafka/server: Disable quota balancer

v2 was enabled by default in:
redpanda-data#16441

Running the balancer doesn't do anything other
than waste cpu cycles.

Signed-off-by: Ben Pope <ben@redpanda.com>
(cherry picked from commit e0ba45e)

src/v/config/configuration.cc

@@ -2829,7 +2829,7 @@ configuration::configuration()
       "milliseconds. Value of 0 disables the balancer and makes all the "
       "throughput quotas immutable.",
       {.needs_restart = needs_restart::no, .visibility = visibility::user},
-      750ms,
+      0ms,
       {.min = 0ms})
   , kafka_quota_balancer_min_shard_throughput_ratio(
       *this,