Cannot create the dark medium contrast and dark high contrast theme.

[fwu1234]

Cannot create the dark medium contrast and dark high contrast theme. A clear and concise description of what the bug is.

To Reproduce Steps to reproduce the behavior:

1. Go to 'Material theme builder'
2. Click on 'update'

Expected behavior MTB can create light, dark, light-high-contrast, dark-high-contrast, light-medium-contrast, dark-medium-contrast styles. It can also create light, dark, light-high-contrast, light-medium-contrast modes and variables, which are great. But, it cannot create dark-high-contrast, and dark-medium-contrast modes and variables. We have to manually add these styles to the modes. It'd be great if MTB can automatically create the dark-high-contrast, and dark-medium-contrast modes and variables.

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context Add any other context about the problem here.