fix: set default value for API_RESPONSE_DELAY to undefined

Author: joshunrau

.env.template

@@ -77,7 +77,7 @@ GATEWAY_DEV_SERVER_PORT=3500
 # The port to use for the Vite (full web app) development server
 WEB_DEV_SERVER_PORT=3000
 # Set an arbitrary delay (in milliseconds) for all responses (useful for testing suspense)
-API_RESPONSE_DELAY=0
+API_RESPONSE_DELAY=
 # If set to 'true' and NODE_ENV === 'development', then login is automated
 VITE_DEV_BYPASS_AUTH=false
 # The username to use if VITE_DEV_BYPASS_AUTH is set to true