Removed more references to the unused option

Duplicati/Library/Main/Options.cs

@@ -87,11 +87,6 @@ namespace Duplicati.Library.Main
         /// </summary>
         private const string DEFAULT_READ_WRITE_TIMEOUT = "30s";
 
-        /// <summary>
-        /// The default asynchronous upload limit
-        /// </summary>
-        private const int DEFAULT_ASYNCHRONOUS_UPLOAD_LIMIT = 4;
-
         /// <summary>
         /// The default number of concurrent uploads
         /// </summary>

Duplicati/UnitTest/Issue6200.cs

@@ -42,7 +42,6 @@ namespace Duplicati.UnitTest
                 no_auto_compact = true,
                 zip_compression_level = 0,
                 asynchronous_concurrent_upload_limit = 1,
-                asynchronous_upload_limit = 1,
                 blocksize = "100kb",
                 dblock_size = "1mb"
             });

Duplicati/UnitTest/Issue6254.cs

@@ -43,7 +43,6 @@ namespace Duplicati.UnitTest
                 no_auto_compact = true,
                 zip_compression_level = 0,
                 asynchronous_concurrent_upload_limit = 1,
-                asynchronous_upload_limit = 1,
                 blocksize = "100kb",
                 dblock_size = "4mb"
             });