chore: reduce per block prune of TWAP from 1000 to 200 (#7638)

* reduce per block prune of twap from 1000 to 200

* fix comment

x/twap/store.go

@@ -12,14 +12,12 @@ import (
 )
 
 // NumRecordsToPrunePerBlock is the number of records to prune per block.
-// Two records are deleted per incentive record:
-// 1. by time index
-// 2. by pool index
-// Therefore, setting this to 1000 means 500 complete incentive records are deleted per block.
+// One record indexed by pool ID is deleted per incentive record.
+// Therefore, setting this to 200 means 200 complete incentive records are deleted per block.
 // The choice is somewhat arbitrary
 // However, th intuition is that the number should be low enough to not make blocks take longer but
 // not too small where it would take all the way to the next epoch.
-var NumRecordsToPrunePerBlock uint16 = 1000
+var NumRecordsToPrunePerBlock uint16 = 200
 
 type timeTooOldError struct {
 	Time time.Time