Lower latenct-monitor-threashold in expire-cycle test case (#1584)

The test case checks for expire-cycle in LATENCY LATEST, but with the
new hash table, the expiry-cycle is too fast to be logged by latency
monitor. Lower the latency monitor threshold to make it more likely to
be logged.

Fixes #1580

---------

Signed-off-by: Viktor Söderqvist <viktor.soderqvist@est.tech>

tests/unit/latency-monitor.tcl

@@ -143,7 +143,7 @@ tags {"needs:debug"} {
 } ;# tag
 
     test {LATENCY of expire events are correctly collected} {
-        r config set latency-monitor-threshold 20
+        r config set latency-monitor-threshold 1
         r config set lazyfree-lazy-expire no
         r flushdb
         if {$::valgrind} {set count 100000} else {set count 1000000}