rm class_db.h from resource.h

modules/dds/texture_loader_dds.cpp

@@ -34,6 +34,7 @@
 
 #include "core/io/file_access.h"
 #include "core/io/file_access_memory.h"
+#include "core/object/class_db.h"
 #include "scene/resources/image_texture.h"
 
 DDSFormat _dxgi_to_dds_format(uint32_t p_dxgi_format) {