Kernel: Use the correct format string for u64 hex.

src/core/hle/kernel/timer.cpp

@@ -66,7 +66,7 @@ static void TimerCallback(u64 timer_handle, int cycles_late) {
     SharedPtr<Timer> timer = timer_callback_handle_table.Get<Timer>(static_cast<Handle>(timer_handle));
 
     if (timer == nullptr) {
-        LOG_CRITICAL(Kernel, "Callback fired for invalid timer %08X", timer_handle);
+        LOG_CRITICAL(Kernel, "Callback fired for invalid timer %08lX", timer_handle);
         return;
     }