Kernel: Use StringView literals instead of empty Strings in ProcFS

Author: https://github.com/IdanHo
Commit: 119f900451
Pull-request: https://github.com/SerenityOS/serenity/pull/11848
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/bgianfo ✅

Kernel/GlobalProcessExposed.cpp

@@ -480,8 +480,8 @@ private:
                     break;
                 }
             } else {
-                process_object.add("pledge", String());
+                process_object.add("pledge", ""sv);
-                process_object.add("veil", String());
+                process_object.add("veil", ""sv);
             }
 
             process_object.add("pid", process.pid().value());