Applications: Use new global variables at /sys/kernel/ directory

Author: https://github.com/supercomputer7
Commit: 5dfb2b18f3
Pull-request: https://github.com/SerenityOS/serenity/pull/15593
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/kleinesfilmroellchen ✅

Userland/Demos/WidgetGallery/main.cpp

@@ -17,7 +17,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     TRY(Core::System::pledge("stdio recvfd sendfd rpath unix thread"));
     auto app = TRY(GUI::Application::try_create(arguments, Core::EventLoop::MakeInspectable::Yes));
 
-    TRY(Core::System::unveil("/proc/all", "r"));
+    TRY(Core::System::unveil("/sys/kernel/processes", "r"));
     TRY(Core::System::unveil("/tmp/session/%sid/portal/filesystemaccess", "rw"));
     TRY(Core::System::unveil("/res", "r"));
     TRY(Core::System::unveil("/etc/FileIconProvider.ini", "r"));