dashboard: unset known issue for staticlockranking builder

CL 207619 has been submitted to master, fixing golang.org/issue/38029.
The linux-amd64-staticlockranking builder has been passing since then.
Unset its known issue so that if there are regressions in the future,
they can be investigated.

For golang/go#38029.
For golang/go#37937.

Change-Id: I0de8e4ac122effee56aac73c741fab41512ff0c2
Reviewed-on: https://go-review.googlesource.com/c/build/+/227544
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
diff --git a/dashboard/builders.go b/dashboard/builders.go
index c323b22..f095ac2 100644
--- a/dashboard/builders.go
+++ b/dashboard/builders.go
@@ -1625,10 +1625,9 @@
 		},
 	})
 	addBuilder(BuildConfig{
-		Name:       "linux-amd64-staticlockranking",
-		HostType:   "host-linux-stretch",
-		Notes:      "builder with GOEXPERIMENT=staticlockranking, see golang.org/issue/38029",
-		KnownIssue: 38029,
+		Name:     "linux-amd64-staticlockranking",
+		HostType: "host-linux-stretch",
+		Notes:    "builder with GOEXPERIMENT=staticlockranking, see golang.org/issue/37937",
 		buildsRepo: func(repo, branch, goBranch string) bool {
 			return repo == "go" && atLeastGo1(goBranch, 15)
 		},