Update app.py

app.py

@@ -46,7 +46,8 @@ print("cloning stable-diffusion-webui repo")
 Gitclone(r"https://github.com/AUTOMATIC1111/stable-diffusion-webui.git",user_home / r"stable-diffusion-webui")
 os.system("git remote add reForge https://github.com/Panchovix/stable-diffusion-webui-reForge")
 os.system("git fetch reForge")
-os.system("git checkout -b dev_upstream_experimental reForge/dev_upstream_experimental")
+os.system("git checkout -b experimental reForge/experimental")
+os.system("git branch -u reForge/experimental")
 os.system("git stash")
 os.system("git pull")
 #install extensions