Properly fix the native messaging host file

Summary:

• Previous approch broke the installation for the non-root installation where make install was performed as user
• Add option COPY_MESSAGING_HOST_FILE_HOME option to cmake configuration which allows to copy the host file to user specific paths where relevant applications look for.

Test Plan:
tested on neon system by removing package installed path and doing make
install as normal user

Reviewers: mwolff, broulik, davidedmundson

Reviewed By: davidedmundson

Subscribers: plasma-devel

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D12694