Fix generator and test paths of CMake

Summary:
In D22095 the location of the CMake highlighter files was changed, the previous paths are restored.

/generators/ -> /data/generators/
/input/ -> /autotests/input/
/reference/ -> /autotests/reference/
/html/ -> /autotests/html/

Reviewers: Framework: Syntax Highlighting, dhaumann, cullmann

Reviewed By: Framework: Syntax Highlighting, cullmann

Subscribers: kwrite-devel, kde-frameworks-devel

Tags: Kate, Frameworks

Differential Revision: https://phabricator.kde.org/D22568