repl: fix disruptive autocomplete without inspector

Fix an issue where the autocomplete wrongly autocompletes
a value from a correct value to an undefined value when node
is built without an inspector by disabling the preview view

fixes: nodejs#40635

lib/internal/repl/utils.js

@@ -366,7 +366,8 @@ function setupPreview(repl, contextSymbol, bufferSymbol, active) {
 
   const showPreview = () => {
     // Prevent duplicated previews after a refresh.
-    if (inputPreview !== null || !repl.isCompletionEnabled) {
+    if (inputPreview !== null || !repl.isCompletionEnabled ||
+        !process.features.inspector) {
       return;
     }