vdl/js: Add serverCall to the generated stub.

Change-Id: I537e13747e9db15944b7e6260d526cbaf72a687c
diff --git a/lib/vdl/codegen/javascript/gen.go b/lib/vdl/codegen/javascript/gen.go
index b6104a4..787b785 100644
--- a/lib/vdl/codegen/javascript/gen.go
+++ b/lib/vdl/codegen/javascript/gen.go
@@ -229,7 +229,7 @@
 
 // Returns a Not Implemented stub for the method
 func generateMethodStub(method *compile.Method) string {
-	args := "ctx"
+	args := "ctx, serverCall"
 	for _, arg := range method.InArgs {
 		args += fmt.Sprintf(", %s", arg.Name)
 	}