Describe the bug
Autoscaling notification doesn't show the inputted values, it shows the variables

To Reproduce
Steps to reproduce the behavior:

1. Go to the workers tab
2. Click on a worker
3. Input two values for autoscaling (min and max values)
4. See error

Expected behavior
It should show the values you inputted for min and max.

Screenshots

System information
Output of python -c 'from flower.utils import bugreport; print(bugreport())' command

python3 -c 'from flower.utils import bugreport; print(bugreport())'

flower -> flower:2.0.1 tornado:6.4.2 humanize:4.12.1
software -> celery:5.4.0 (opalescent) kombu:5.4.2 py:3.9.20
billiard:4.2.1 py-amqp:5.3.1
platform -> system:Linux arch:64bit
kernel version:5.15.0-1052-oracle imp:CPython
loader -> celery.loaders.app.AppLoader
settings -> transport:amqp results:disa 5A5E bled

deprecated_settings: None