Removal of deprecated getters

[0pilatos0]

This pull request addresses an issue in the latest version of Flutter, where the buttonColor and accentTextTheme getters have been deprecated, causing build failures. To resolve these issues, this pull request removes both getters from the codebase.

Changes Made:

Removed the deprecated buttonColor getter Removed the deprecated accentTextTheme getter

Additional Notes: It's worth noting that the deprecation of these getters aligns with Flutter's latest recommendations and changes in the framework. Removing them ensures the codebase remains up to date and avoids any potential issues in future versions of Flutter.

https://docs.flutter.dev/release/breaking-changes/theme-data-accent-properties