fix flaky latency test (#11636)
Fix a flaky test that probably fails on overload timing issues.
This unit starts with
```
# Set a threshold high enough to avoid spurious latency events.
r config set latency-monitor-threshold 200
```
but later the test measuring expire event changes the threshold.
this fix is to revert it to 200 after that test.
Got this error (ARM+TLS)
```
*** [err]: LATENCY RESET is able to reset events in tests/unit/latency-monitor.tcl
Expected [r latency latest] eq {} (context: type eval line 3 cmd {assert {[r latency latest] eq {}}} proc ::test)
```
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