Use CMake find_dependency instead of find_package in CMake config file template.
Summary: find_dependency correctly propagates the QUIET parameter from the original find_package call and is recommended for use in CMake config files as per https://cmake.org/cmake/help/v3.1/module/CMakeFindDependencyMacro.html
Reviewers: KTextEditor, dhaumann
Reviewed By: KTextEditor, dhaumann
Subscribers: kwrite-devel, kde-frameworks-devel
Tags: KTextEditor, Kate, Frameworks
Differential Revision: https://phabricator.kde.org/D23203