refactor: extrct Setting wiget

Signed-off-by: OctagonalStar <76486554+OctagonalStar@users.noreply.github.com>

Author: OctagonalStar

lib/package_replacement/fake_dart_io.dart

@@ -5,7 +5,7 @@ class File {
     // nothing
     return "";
   }
-  bool existsSync() {return true;}
+  bool existsSync() {return false;}
 
   void deleteSync() {}