Sync .conf default with real config default

See a0abc1e

keydb.conf

@@ -1998,7 +1998,7 @@ jemalloc-bg-thread yes
 
 # The minimum number of clients on a thread before KeyDB assigns new connections to a different thread
 #  Tuning this parameter is a tradeoff between locking overhead and distributing the workload over multiple cores
-# min-clients-per-thread 50
+# min-clients-per-thread 20
 
 # How often to run RDB load progress callback?
 # The callback runs during key load to ping other servers and prevent timeouts.