debugger: remove final lint exceptions in inspect_repl.js

Adding a return when it's not really a getter is kind of misleading, but
so is using a getter for something that doesn't return anything, so
¯\_(ツ)_/¯.

lib/internal/inspector/inspect_repl.js

@@ -1,6 +1,3 @@
-// TODO(trott): enable ESLint
-/* eslint-disable getter-return */
-
 'use strict';
 
 const {
@@ -899,7 +896,7 @@ function createRepl(inspector) {
 
     copyOwnProperties(context, {
       get help() {
-        print(HELP);
+        return print(HELP);
       },
 
       get run() {
@@ -1078,7 +1075,7 @@ function createRepl(inspector) {
         repl.setPrompt('> ');
 
         print('Press Ctrl+C to leave debug repl');
-        repl.displayPrompt();
+        return repl.displayPrompt();
       },
 
       get version() {