Update shell/platform/darwin/ios/framework/Source/FlutterPlatformViews.mm

Co-authored-by: Jenn Magder <[email protected]>

Author: dacianf

shell/platform/darwin/ios/framework/Source/FlutterPlatformViews.mm

@@ -130,7 +130,7 @@
 
   long viewId = [args[@"id"] longValue];
   NSString* viewTypeString = args[@"viewType"];
-  std::string viewType([args[@"viewType"] UTF8String]);
+  std::string viewType(viewTypeString.UTF8String);
 
   if (views_.count(viewId) != 0) {
     result([FlutterError errorWithCode:@"recreating_view"