There are problems with the user-mode code in the pidhide

Maybe adding `bpf_program__set_autoattach(skel->progs.handle_getdents_patch, false);` before the code `err = pidhide_bpf__load(skel);` is a good choice? 

In my test, I found that function `handle_getdents_patch` will also be automatically mounted, not just called by `bpf_tail_call`


