Move konqpopupmenuplugin.desktop from kde-baseapps to kio

This ensures that service menu entries are shown if the unreleased
KF5-based version of lib/konq from kde-baseapps is not installed

It would be great if the translations from lib/konq in kde-baseapps
could be merged. Thanks!

BUG: 350769
Change-Id: Id2c9a73ce95a6c8b704f3a1000c0292d1864a352
REVIEW: 125425
CCMAIL: luigi.toscano@tiscali.it