Lua: fix multi-line string
Summary:
Strings that end with \z or \ can continue to the next line
BUG: 395515
Reviewers: dhaumann, cullmann, KTextEditor, Kate
Reviewed By: dhaumann, KTextEditor, Kate
Subscribers: kde-frameworks-devel
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D13829