fix: call apply_flex_dispatcher_backend with correct backend in MoE pretrain recipes#2288

ko3n1g merged 1 commit intomainNVIDIA-NeMo/Megatron-Bridge:mainfrom

yuya/fix-flex-dispatcher-backend-recipesNVIDIA-NeMo/Megatron-Bridge:yuya/fix-flex-dispatcher-backend-recipesCopy head branch name to clipboard