remove redundant splitby middleware (#8996)

Found this double-copied line which a mistake. This PR removes one of
them which won't change behavior (besides removing duplicate spans/etc).

pkg/querier/queryrange/roundtrip.go

@@ -317,7 +317,6 @@ func NewLogFilterTripperware(
 			NewLimitsMiddleware(limits),
 			NewQuerySizeLimiterMiddleware(schema.Configs, log, limits, codec, statsHandler),
 			queryrangebase.InstrumentMiddleware("split_by_interval", metrics.InstrumentMiddlewareMetrics),
-			queryrangebase.InstrumentMiddleware("split_by_interval", metrics.InstrumentMiddlewareMetrics),
 			SplitByIntervalMiddleware(schema.Configs, limits, codec, splitByTime, metrics.SplitByMetrics),
 		}