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

Author: https://github.com/supercomputer7
Commit: 9d1ba0e6ad
Pull-request: https://github.com/SerenityOS/serenity/pull/15593
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/kleinesfilmroellchen ✅

Userland/Utilities/pidof.cpp

@@ -43,7 +43,7 @@ static ErrorOr<int> pid_of(String const& process_name, bool single_shot, bool om
 ErrorOr<int> serenity_main(Main::Arguments args)
 {
     TRY(Core::System::pledge("stdio rpath"));
-    TRY(Core::System::unveil("/proc/all", "r"));
+    TRY(Core::System::unveil("/sys/kernel/processes", "r"));
     TRY(Core::System::unveil("/etc/passwd", "r"));
     TRY(Core::System::unveil(nullptr, nullptr));