ControlPixArtHalf.forward_c and ControlPixArtMSHalf.forward_raw still use the
pre-rename name lewei_scale, both for the attribute and for the
get_2d_sincos_pos_embed keyword. Neither exists any more, so both PixArt
ControlNet targets fail on the first forward pass.
Signed-off-by: Anai-Guo <antai12232931@outlook.com>