crypto/ssh: trivial spacing change for gofmt compliance

Extra space added by 'gofmt -w' to align key/value columns
in the new test (TestParseCertWithOptions).

Follow-up on https://go-review.googlesource.com/#/c/9375/.

Change-Id: Id7dd0bc420888f12ce0af4178096bdc9f5c57161
Reviewed-on: https://go-review.googlesource.com/9627
Reviewed-by: Adam Langley <agl@golang.org>

ssh/certs_test.go

@@ -57,7 +57,7 @@ const exampleSSHCertWithOptions = `ssh-rsa-cert-v01@openssh.com AAAAHHNzaC1yc2Et
 func TestParseCertWithOptions(t *testing.T) {
 	opts := map[string]string{
 		"source-address": "192.168.1.0/24",
-		"force-command": "/bin/sleep",
+		"force-command":  "/bin/sleep",
 	}
 	exts := map[string]string{
 		"permit-X11-forwarding":   "",