changed payment code to demo code

backend/core/utils.py

@@ -400,6 +400,6 @@ def generate_residual_risk_graph(risks_with_controls):
 
     return base64.b64encode(image_png).decode("utf-8")
 
-def generate_payment_code(length=6):
+def generate_demo_code(length=6):
     chars = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789'
     return ''.join(random.choices(chars, k=length))