math/rand/v2: use max builtin in tests

Change-Id: I6d0050319c66fb62c817206e646e1a9449dc444c
Reviewed-on: https://go-review.googlesource.com/c/go/+/585715
Reviewed-by: Dmitri Shuralyov <[email protected]>
Auto-Submit: Tobias Klauser <[email protected]>
Reviewed-by: Robert Griesemer <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
Auto-Submit: Robert Griesemer <[email protected]>

Author: tklauser

src/math/rand/v2/rand_test.go

@@ -31,13 +31,6 @@ type statsResults struct {
 	maxError    float64
 }
 
-func max(a, b float64) float64 {
-	if a > b {
-		return a
-	}
-	return b
-}
-
 func nearEqual(a, b, closeEnough, maxError float64) bool {
 	absDiff := math.Abs(a - b)
 	if absDiff < closeEnough { // Necessary when one value is zero and one value is close to zero.