Disabled the dropwown, but the color isnot gray

[yinshunyao]

Set the dropdown to be disabled, but the color is normal

Code example to reproduce the issue:

import flet as ft

def main(page: ft.Page):
    drop = ft.Dropdown(
        label="disabled but color is wrong",
        options=[ft.dropdown.Option(str(i)) for i in range(3)])
    text = ft.TextField(value="disabled", disabled=True)
    drop1 = ft.Dropdown(
        label="disabled set color gray",
        options=[ft.dropdown.Option(str(i)) for i in range(3)],
        disabled=True, border_color=ft.colors.GREY_300, label_style=ft.TextStyle(color=ft.colors.GREY_400))

    drop.disabled = True
    page.add(drop)
    page.add(text)
    page.add(drop1)

if __name__ == '__main__':
    ft.app(target=main, name="index", host='0.0.0.0', port=37876, view=ft.WEB_BROWSER)

**Describe the results you received:
the color of the first control named drop isnot gray
**

Describe the results you expected:all controls are gray, including the control named drop

Additional information you deem important (e.g. issue happens only occasionally):

Flet version (pip show flet):

flet                      0.21.2
flet-core                 0.21.2
flet-runtime              0.21.2

Give your requirements.txt file (don't pip freeze, instead give direct packages):

(The requirements)

Operating system: MacOS

Additional environment details: