Update app.py

app.py

@@ -1,9 +1,11 @@
 import subprocess
+import os
 
 # Clone the repository
 subprocess.run(["git", "clone", "https://github.com/facefusion/facefusion"], check=True)
 
-subprocess.run(["cd", "facefusion"], check=True)
+# chande directory to face fusion to run ui
+os.chdir("facefusion")
 
 # Run the ui
 subprocess.run(["python", "run.py", "--execution-providers", "cpu"], check=True)