kernel: make path_umount backporting as optional

Since https://github.com/backslashxx/KernelSU/commit/4f8943a, path_umount is no longer needed.

Signed-off-by: rsuntk <rsuntk@yukiprjkt.my.id>

kernel/core_hook.c

@@ -184,7 +184,7 @@ void escape_to_root(void)
 	       sizeof(cred->cap_bset));
 
 	setup_groups(profile, cred);
-	
+
 	rcu_read_unlock();
 
 	// Refer to kernel/seccomp.c: seccomp_set_mode_strict