Remove replaceItems in vuex devices service

[insanity54]

This one is caused by the following bug

feathersjs-ecosystem/feathers-vuex#189

The bug in Controlpointer's perspective is that when deleting games with associated devices, the feathers service.update in the disassociate-device.js hook is not properly triggering reactivity in the /device/:deviceId page. A workaround is to add replaceItems flag in the Vuex service definition.

controlpointer/src_client/store/index.js there is an @todo flag here on line 27 that is a workaround for the following bug. This issue can be closed by upgrading Vue and removing the replaceItems flag.