Update launch.py

launch.py

@@ -129,7 +129,7 @@ if not is_installed("clip"):
 if not is_installed("xformers") and xformers:
     if platform.system() == "Windows":
         run_pip("install https://github.com/C43H66N12O12S2/stable-diffusion-webui/releases/download/a/xformers-0.0.14.dev0-cp310-cp310-win_amd64.whl", "xformers")
-    elif:
+    elif platform.system() == "Linux":
         run_pip("install xformers", "xformers")
 
 os.makedirs(dir_repos, exist_ok=True)