fix the icons 50 and 57 in contents.json

the 50x50 icons are actually meant for ipad, but in our ios.dart they are marked as iphone. while the 57x57 should be 1x and 2x, while in our ios.dart we're using 1x and 3x

Author: adnanjpg

lib/ios.dart

@@ -54,7 +54,8 @@ void createIcons(FlutterLauncherIconsConfig config, String? flavor) {
     image.channels = Channels.rgb;
   }
   if (image.channels == Channels.rgba) {
-    print('\nWARNING: Icons with alpha channel are not allowed in the Apple App Store.\nSet "remove_alpha_ios: true" to remove it.\n');
+    print(
+        '\nWARNING: Icons with alpha channel are not allowed in the Apple App Store.\nSet "remove_alpha_ios: true" to remove it.\n');
   }
   String iconName;
   final dynamic iosConfig = config.ios;
@@ -262,13 +263,13 @@ List<Map<String, String>> createImageList(String fileNamePrefix) {
         .toJson(),
     ContentsImageObject(
             size: '50x50',
-            idiom: 'iphone',
+            idiom: 'ipad',
             filename: '$fileNamePrefix[email protected]',
             scale: '1x')
         .toJson(),
     ContentsImageObject(
             size: '50x50',
-            idiom: 'iphone',
+            idiom: 'ipad',
             filename: '$fileNamePrefix[email protected]',
             scale: '2x')
         .toJson(),
@@ -281,7 +282,7 @@ List<Map<String, String>> createImageList(String fileNamePrefix) {
     ContentsImageObject(
             size: '57x57',
             idiom: 'iphone',
-            filename: '$fileNamePrefix-57x57@3x.png',
+            filename: '$fileNamePrefix-57x57@2x.png',
             scale: '2x')
         .toJson(),
     ContentsImageObject(