Bind Win32 main-thread queue to runtime state

src/platform_windows/windows_runtime_shell.cpp

@@ -120,6 +120,7 @@ App* bound_app() noexcept
 void release_bound_app() noexcept
 {
     bind_app(nullptr);
+    bind_runtime(nullptr);
     retained_owned_app().reset();
 }
 
@@ -136,6 +137,7 @@ int run_main_application(int argc, char** argv)
     owned_app = std::make_unique<App>();
     auto* app = owned_app.get();
     bind_app(app);
+    bind_runtime(&app->runtime());
     app->set_platform_services(&pp::platform::windows::platform_services());
     app->initLog();