[GTK][WPE] Remote Web Inspector: the remote inspector(HTTP) does not work from any browsers

https://bugs.webkit.org/show_bug.cgi?id=253145

Reviewed by Carlos Garcia Campos.

Add missing function: engineeringSettingsAllowed to BrowserInspectorFrontendHost.

It solves a regression from: WebKit/WebKit@2326b11

* Source/WebInspectorUI/UserInterface/Base/BrowserInspectorFrontendHost.js:
(window.InspectorFrontendHost.WI.BrowserInspectorFrontendHost.prototype.engineeringSettingsAllowed):

Canonical link: https://commits.webkit.org/261056@main

Author: pgorszkowski-igalia

Source/WebInspectorUI/UserInterface/Base/BrowserInspectorFrontendHost.js

@@ -362,6 +362,11 @@ if (!window.InspectorFrontendHost) {
             throw "unimplemented";
         }
 
+        engineeringSettingsAllowed()
+        {
+            return false;
+        }
+
         // Private
 
         _sendPendingMessagesToBackendIfNeeded()