cmd/coordinator: remove gofmt inconsistency

Issue golang/go#22852 modifies formatting for Go tables. If the
code stays as is, users running Go 1.9 will format the file one way
and users running tip will format the file a different way. This is
problematic when git-codereview attempts to check the file is gofmt'ed
correctly, and does not let you mail commits that aren't.

Adding another newline makes the file compatible with tip and the
stable release branch and avoids this problem.

Change-Id: I0dbfe01db6e07578993e793e3710702ff2518436
Reviewed-on: https://go-review.googlesource.com/104836
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

cmd/coordinator/coordinator.go

@@ -2517,6 +2517,7 @@ var fixedTestDuration = map[string]Seconds{
 	"test:4_5":                               10,
 	"codewalk":                               2.42,
 	"api":                                    7.38,
+
 	"go_test_bench:compress/bzip2":    3.059513602,
 	"go_test_bench:image/jpeg":        3.143345345,
 	"go_test_bench:encoding/hex":      3.182452293,