[XAM] Simplified loader_data structure.

- Removed launch_data_present replaced with empty check

Fixed regression introduced in 269ee61845

src/xenia/app/xenia_main.cc

@@ -762,7 +762,7 @@ void EmulatorApp::EmulatorThread() {
   if (xam) {
     xam->LoadLoaderData();
 
-    if (xam->loader_data().launch_data_present) {
+    if (!xam->loader_data().host_path.empty()) {
       const std::filesystem::path host_path = xam->loader_data().host_path;
       app_context().CallInUIThread([this, host_path]() {
         return emulator_window_->RunTitle(host_path);

src/xenia/kernel/xam/xam_info.cc

@@ -247,7 +247,6 @@ DECLARE_XAM_EXPORT1(XamGetExecutionId, kNone, kImplemented);
 dword_result_t XamLoaderSetLaunchData_entry(lpvoid_t data, dword_t size) {
   auto xam = kernel_state()->GetKernelModule<XamModule>("xam.xex");
   auto& loader_data = xam->loader_data();
-  loader_data.launch_data_present = size ? true : false;
   loader_data.launch_data.resize(size);
   std::memcpy(loader_data.launch_data.data(), data, size);
   return 0;
@@ -275,7 +274,7 @@ dword_result_t XamLoaderGetLaunchData_entry(lpvoid_t buffer_ptr,
                                             dword_t buffer_size) {
   auto xam = kernel_state()->GetKernelModule<XamModule>("xam.xex");
   auto& loader_data = xam->loader_data();
-  if (!buffer_size) {
+  if (loader_data.launch_data.empty()) {
     return X_ERROR_NOT_FOUND;
   }
 
@@ -298,7 +297,6 @@ void XamLoaderLaunchTitle_entry(lpstring_t raw_name_ptr, dword_t flags) {
   // Translate the launch path to a full path.
   if (raw_name_ptr && !raw_name_ptr.value().empty()) {
     loader_data.launch_path = xe::path_to_utf8(raw_name_ptr.value());
-    loader_data.launch_data_present = true;
     xam->SaveLoaderData();
     title = "Title was restarted";
     message =

src/xenia/kernel/xam/xam_module.cc

@@ -66,12 +66,10 @@ void XamModule::LoadLoaderData() {
   FILE* file = xe::filesystem::OpenFile(kXamModuleLoaderDataFileName, "rb");
 
   if (!file) {
-    loader_data_.launch_data_present = false;
+    loader_data_.launch_data.clear();
     return;
   }
 
-  loader_data_.launch_data_present = true;
-
   auto string_read = [file]() {
     uint16_t string_size = 0;
     fread(&string_size, sizeof(string_size), 1, file);

src/xenia/kernel/xam/xam_module.h

@@ -31,7 +31,6 @@ class XamModule : public KernelModule {
   static void RegisterExportTable(xe::cpu::ExportResolver* export_resolver);
 
   struct LoaderData {
-    bool launch_data_present = false;
     std::string host_path;  // Full host path to next title to load
     std::string
         launch_path;  // Full guest path to next xex. might be default.xex