misc syntax error fix

app.py

@@ -123,7 +123,7 @@ with gr.Blocks(title="RFD3 Test") as demo:
     def generate(config_ready, scaffold_ready, num_batches, num_designs_per_batch, length):
         if config_ready is None or scaffold_ready is None:
             return None, None
-        if config_ready is "upload" and scaffold_ready is "no_input":
+        if config_ready == "upload" and scaffold_ready == "no_input":
             gen_directory, gen_results = unconditional_generation_with_input_config(config_upload)
             return gen_directory, gen_results
         if config_ready=="manual" and scaffold_ready=="no_input":