refactored how the default bucket is passed along through the list api

Author: ekjotmultani

packages/storage/amplify_storage_s3_dart/lib/src/storage_s3_service/service/storage_s3_service_impl.dart

@@ -125,9 +125,7 @@ class StorageS3Service {
         const S3ListPluginOptions();
 
     final resolvedPath = await _pathResolver.resolvePath(path: path);
-    final s3ClientInfo = options.bucket == null
-        ? getS3ClientInfo()
-        : getS3ClientInfo(storageBucket: options.bucket);
+    final s3ClientInfo = getS3ClientInfo(storageBucket: options.bucket);
 
     if (!s3PluginOptions.listAll) {
       final request = s3.ListObjectsV2Request.build((builder) {
@@ -159,10 +157,8 @@ class StorageS3Service {
     try {
       final request = s3.ListObjectsV2Request.build((builder) {
         builder
-          ..bucket = options.bucket == null
-              ? _storageOutputs.bucketName
-              // ignore: invalid_use_of_internal_member
-              : options.bucket!.resolveBucketInfo(_storageOutputs).bucketName
+    
+          ..bucket = s3ClientInfo.bucketName
           ..prefix = resolvedPath
           ..delimiter = s3PluginOptions.excludeSubPaths
               ? s3PluginOptions.delimiter