Update app.py

I think this fixes the issue?

app.py

@@ -183,7 +183,7 @@ def add_new_eval(
     )
 
     # Remove the local file
-    os.remove(temp_out)
+    os.remove(temp_out_file)
     
     print("Starting compute space at %s " % COMPUTE_SPACE)
     return start_compute_space()