Update get_2d_sincos_pos_embed to use output_type='pt' for Diffusers compat#504

feifeibear merged 2 commits intoxdit-project:mainxdit-project/xDiT:mainfrom

fielding:fix/get-2d-sincos-pos-embed-output-typefielding/xDiT:fix/get-2d-sincos-pos-embed-output-typeCopy head branch name to clipboard