buffer: removed unneeded FastBuffer constructor

PR-URL: #19684
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Jackson Tian <shyvo1987@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: TimothyGu

lib/buffer.js

@@ -76,11 +76,7 @@ const { setupBufferJS } = internalBuffer;
 
 const bindingObj = {};
 
-class FastBuffer extends Uint8Array {
-  constructor(arg1, arg2, arg3) {
-    super(arg1, arg2, arg3);
-  }
-}
+class FastBuffer extends Uint8Array {}
 FastBuffer.prototype.constructor = Buffer;
 internalBuffer.FastBuffer = FastBuffer;