benchmark/parse: fix format

The format of the parse_test.go file was not consistent. This commit
fixes the format of the file.

Change-Id: I5ee8d5ae77b9830f58f15d83e724875367e894bd
Reviewed-on: https://go-review.googlesource.com/c/tools/+/566376
Reviewed-by: Robert Findley <rfindley@google.com>
Auto-Submit: Robert Findley <rfindley@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>

benchmark/parse/parse_test.go

@@ -59,11 +59,11 @@ func TestParseLine(t *testing.T) {
 		// error handling cases
 		{
 			line: "BenchPress	100	        19.6 ns/op", // non-benchmark
-			err: true,
+			err:  true,
 		},
 		{
 			line: "BenchmarkEncrypt	lots	        19.6 ns/op", // non-int iterations
-			err: true,
+			err:  true,
 		},
 		{
 			line: "BenchmarkBridge	100000000	        19.6 smoots", // unknown unit