chore: fix JavaScript lint errors

Move onDrain out of onCommand in end.js so it sits at the same scope as
onCommand, matching the convention already used by next.js, prev.js,
last.js, jump.js, and friends. Resolves the
stdlib/no-unnecessary-nested-functions lint error reported by the
automated workflow.

Closes: #11803

Author: mvanhorn

lib/node_modules/@stdlib/repl/presentation/lib/commands/end.js

@@ -37,15 +37,15 @@ function command( pres ) {
 	*/
 	function onCommand() {
 		pres._repl.once( 'drain', onDrain ); // eslint-disable-line no-underscore-dangle
+	}
 
-		/**
-		* Callback invoked upon a `drain` event.
-		*
-		* @private
-		*/
-		function onDrain() {
-			pres.end().show();
-		}
+	/**
+	* Callback invoked upon a `drain` event.
+	*
+	* @private
+	*/
+	function onDrain() {
+		pres.end().show();
 	}
 }