Rename NPN-Server test.

That is an extremely confusing name. It should be NPN-Declined-TLS13.

Change-Id: I0e5fa50a3ddb0b80e88a8bc10d0ef87d0fff0a54
Reviewed-on: https://boringssl-review.googlesource.com/11227
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>

ssl/test/runner/runner.go

@@ -5000,7 +5000,7 @@ func addExtensionTests() {
 	})
 	testCases = append(testCases, testCase{
 		testType: serverTest,
-		name:     "NPN-Server",
+		name:     "NPN-Declined-TLS13",
 		config: Config{
 			MaxVersion: VersionTLS13,
 			NextProtos: []string{"bar"},