Separate icon config for fdroid

fdroid_flutter_icons.yaml

@@ -0,0 +1,6 @@
+flutter_icons:
+  android: "launcher_icon"
+  image_path: "assets/icon-light.png"
+  adaptive_icon_foreground: "assets/icon-light-adaptive-fg.png"
+  adaptive_icon_background: "#ffffff"
+