removing duplicates

removing duplicated requirements (transformers, diffusers) and reorganizing alphabetically to be able to spot duplicates in the future.

requirements.txt

-transformers
-diffusers
 basicsr
+diffusers
+fairscale==0.4.4
+fonts
+font-roboto
 gfpgan
 gradio
+invisible-watermark
+git+https://github.com/crowsonkb/k-diffusion.git
 numpy
-Pillow
-realesrgan
-torch
-transformers
 omegaconf
+piexif
+Pillow
 pytorch_lightning
-diffusers
-invisible-watermark
+realesrgan
 scikit-image>=0.19
-fonts
-font-roboto
-git+https://github.com/crowsonkb/k-diffusion.git
 git+https://github.com/TencentARC/GFPGAN.git@8d2447a2d918f8eba5a4a01463fd48e45126a379
 timm==0.4.12
-fairscale==0.4.4
-piexif
+transformers
+torch