Format platform_manager.dart

Author: AliAbdelfattah

lib/utils/platform_manager.dart

@@ -1,4 +1,3 @@
-
 import 'dart:io';
 
 class PlatformManager {
@@ -12,4 +11,4 @@ class PlatformManager {
 
   bool isAndroid() => Platform.isAndroid;
   bool isIOS() => Platform.isIOS;
-}
+}