stream: fix Readable stream state properties

Looks like they have been accidentally moved in
#31144.

Author: lundibundi

lib/_stream_readable.js

@@ -1215,13 +1215,17 @@ ObjectDefineProperties(Readable.prototype, {
     }
   },
 
+});
+
+ObjectDefineProperties(ReadableState.prototype, {
   // Legacy getter for `pipesCount`
   pipesCount: {
     get() {
       return this.pipes.length;
     }
   },
 
+  // Legacy property for `paused`
   paused: {
     get() {
       return this[kPaused] !== false;