[BUG] Issue with flutter_launcher_icons Background Color on iOS App

Hello,

I am experiencing an issue with flutter_launcher_icons while generating app icons for iOS. Despite setting the background_color_ios correctly in my configuration file, the background of my app icon continues to appear black. The configuration and commands I used are listed below:
`flutter_launcher_icons:
android: true
ios: true
image_path: "assets/images/appLogo.png"
adaptive_icon_background: "#ff5722"
adaptive_icon_foreground: "assets/images/appLogo.png"
min_sdk_android: 21
remove_alpha_ios: true
background_color_ios: "#ff5722"
`