Fix mixed indentation within tests (#3855)

Signed-off-by: Ambrose Chua <ambrose@chua.family>

test/grpc_test.go

@@ -14,8 +14,8 @@ import (
 func TestGrpc(t *testing.T) {
 	corefile := `grpc://.:0 {
 		whoami
-}
-`
+	}`
+
 	g, _, tcp, err := CoreDNSServerAndPorts(corefile)
 	if err != nil {
 		t.Fatalf("Could not get CoreDNS serving instance: %s", err)