fix shop item does not appear

fix placeholder depend

Update for DPP-Core version 5.0.0.34

NPE FIX

fist, you need to setup an pagetool with /dshop ptget, /dshop pt
get a page tool items -> edit it if you want to -> set page tools with /dshop pt -> done!
now your shop's page tools is fully customizable!

* from this version, you need a PlaceholderAPI plugin.
page tools can be apply PlaceholderAPI