Common/FatFsUtil: Add callback for cancelling SD card conversion.

Source/Core/Core/Core.cpp

@@ -503,11 +503,14 @@ static void EmuThread(std::unique_ptr<BootParameters> boot, WindowSystemInfo wsi
   bool sync_sd_folder = core_parameter.bWii && Config::Get(Config::MAIN_WII_SD_CARD) &&
                         Config::Get(Config::MAIN_WII_SD_CARD_ENABLE_FOLDER_SYNC);
   if (sync_sd_folder)
-    sync_sd_folder = Common::SyncSDFolderToSDImage(Core::WantsDeterminism());
+  {
+    sync_sd_folder =
+        Common::SyncSDFolderToSDImage([]() { return false; }, Core::WantsDeterminism());
+  }
 
   Common::ScopeGuard sd_folder_sync_guard{[sync_sd_folder] {
     if (sync_sd_folder && Config::Get(Config::MAIN_ALLOW_SD_WRITES))
-      Common::SyncSDImageToSDFolder();
+      Common::SyncSDImageToSDFolder([]() { return false; });
   }};
 
   // Load Wiimotes - only if we are booting in Wii mode