IOP: ensure we compute the blendop hash before the module one when lo…

…ading default params

src/develop/imageop.c

@@ -77,6 +77,7 @@ void dt_iop_load_default_params(dt_iop_module_t *module)
   dt_develop_blend_init_blend_parameters(module->default_blendop_params, cst);
   dt_iop_commit_blend_params(module, module->default_blendop_params);
   dt_iop_gui_blending_reload_defaults(module);
+  dt_iop_compute_blendop_hash(module);
   dt_iop_compute_module_hash(module);
 }