Superplot "normalise by max" option not propagated to plot script generator

[thomashampson]

Describe the bug Generating a plot script with spectra that have been "normalised by max" results in a plot script that doesn't remember that option.

To Reproduce

1. Load a workspace and open a spectrum plot
2. open the superplot interface by clicking the toolbar button
3. normalise by max
4. copy script to clipboard
5. close plot
6. paste into script editor
7. run script

Expected behavior plots should be normalised

Platform/Version (please complete the following information):

• OS: all
• Mantid Version: presumably all since superplot was added

[github-actions[bot]]

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