In IOS, white backgroud while selecting coundtry code

[ShridharBanavasi1997]

Describe the bug When we open the drop-down to select the country code, the drop-down background is dark. But drop-downs won't cover the entire screen. So in Android, we can see other fields in the backstack. In IoS, this is filled with wight space. It shoud be some tracperent dark color(dark color with opacity reduced)

Package version ^0.7.3+1

Flutter version 3.13.9

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