[modular] Remove last straggling StoryController.AddModule() call in peridot/

This call was extraneous, and its usage has already been replaced. It
was simply missed when transitioning.

TEST=existing
MF-17

Change-Id: I3b594f2835d3a40897d4c9d0e10979a40a0a4d38
diff --git a/tests/benchmarks/story/modular_benchmark_story_session_shell.cc b/tests/benchmarks/story/modular_benchmark_story_session_shell.cc
index 5480df3..23b0f2b 100644
--- a/tests/benchmarks/story/modular_benchmark_story_session_shell.cc
+++ b/tests/benchmarks/story/modular_benchmark_story_session_shell.cc
@@ -201,11 +201,6 @@
   void StoryInfo(fidl::StringPtr story_id) {
     FXL_LOG(INFO) << "StoryInfo()";
     story_provider_->GetController(story_id, story_controller_.NewRequest());
-    fuchsia::modular::Intent intent;
-    intent.handler = settings_.module_url;
-    intent.action = "action";
-    intent.parameters.resize(0);
-    story_controller_->AddModule(nullptr, "root", std::move(intent), nullptr);
 
     TRACE_ASYNC_BEGIN("benchmark", "story/info", 0);
     story_controller_->GetInfo([this](fuchsia::modular::StoryInfo story_info,