stream: fix Readable stream state properties

Looks like they have been accidentally moved in
https://github.com/nodejs/node/pull/31144.

PR-URL: https://github.com/nodejs/node/pull/34886
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Zeyu Yang <himself65@outlook.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Ricky Zhou <0x19951125@gmail.com>

lib/_stream_readable.js

@@ -1216,13 +1216,17 @@ ObjectDefineProperties(Readable.prototype, {
     }
   },
 
-  // Legacy getter for `pipesCount`
+});
+
+ObjectDefineProperties(ReadableState.prototype, {
+  // Legacy getter for `pipesCount`.
   pipesCount: {
     get() {
       return this.pipes.length;
     }
   },
 
+  // Legacy property for `paused`.
   paused: {
     get() {
       return this[kPaused] !== false;