fix: launch image icon size

ios/Podfile.lock

@@ -49,7 +49,7 @@ EXTERNAL SOURCES:
     :path: ".symlinks/plugins/webview_flutter/ios"
 
 SPEC CHECKSUMS:
-  Flutter: 434fef37c0980e73bb6479ef766c45957d4b510c
+  Flutter: 0e3d915762c693b495b44d77113d4970485de6ec
   in_app_review: 4a97249f7a2f539a0f294c2d9196b7fe35e49541
   launch_review: 75d5a956ba8eaa493e9c9d4bf4c05e505e8d5ed0
   package_info: 873975fc26034f0b863a300ad47e7f1ac6c7ec62

ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json

@@ -1,17 +1,17 @@
 {
   "images" : [
     {
-      "filename" : "icon.png",
+      "filename" : "72.png",
       "idiom" : "universal",
       "scale" : "1x"
     },
     {
-      "filename" : "icon.png",
+      "filename" : "144.png",
       "idiom" : "universal",
       "scale" : "2x"
     },
     {
-      "filename" : "icon.png",
+      "filename" : "216.png",
       "idiom" : "universal",
       "scale" : "3x"
     }