use the new install_package form
Summary:
plasmoids can now be used also from binary resource files rcc
which makes a bit of difference in startup times especially on
devices with low storage
use the new macro to generate and install the rcc
Test Plan: still works
Reviewers: Plasma
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D11551