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Describe the bug

FilledButton.bgcolor does not have effect

Code sample

import flet as ft


async def main(page: ft.Page):
    page.theme_mode = ft.ThemeMode.LIGHT
    page.window.width = 370
    page.window.always_on_top = True

    page.add(
        ft.TextButton("Show Loader"),
        ft.FilledButton("Save", bgcolor=ft.Colors.RED, color="white"),
    )


ft.run(main)

To reproduce

Run the code.

Expected behavior

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Screenshots / Videos

Operating System

macOS

Operating system details

macOS

Flet version

0.70.0.dev5066

Regression

Yes, it used to work in a previous Flet version (please specify the version in additional details)

Suggestions

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Logs

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Additional details

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