Allow RGBA colors to the player configs

[DATEx2]

Expected Behavior

#197B51AA color format to be supported

Actual Behavior

#197B51 works
but adding any opacity information fails

Steps to Reproduce

Edit in the vimeo website any color with RGBA format #RRGGBBAA

This is the error returned

{
    "invalid_parameters": [
        {
            "field": "embed.colors.color_one",
            "error_code": 2204,
            "error": "The application has received an invalid parameter. Please get in touch with the app's creator.",
            "developer_message": "The parameters passed to this API endpoint didn't pass Vimeo's validation. Please check the `invalid_parameters` list for more information."
        }
    ],
    "error": "The application has received an invalid parameter. Please get in touch with the app's creator.",
    "link": null,
    "developer_message": "The parameters passed to this API endpoint didn't pass Vimeo's validation. Please check the `invalid_parameters` list for more information.",
    "error_code": 2204
}