Accent Color causing errors for newer Flutter updates

[dallinwelch]

Describe the bug
New error with new Flutter 3.16 where I get this issue flutter_fortune_wheel-1.2.0/lib/src/indicators/triangle_indicator.dar
t:20:33: Error: The getter 'accentColor' isn't defined for the class 'ThemeData'. It happens as well in rectangle_indicator.da
rt:17:63: Error: The getter 'accentColor' isn't defined for the class 'ThemeData'.These can be easily fixed if we replace with a real color.

To Reproduce
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4. See error

Expected behavior
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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
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