fix additionalDeliminator attribute
Summary:
The initialization of the Rule::m_wordDelimiter cache was done before the delimiters were extracted, which can invalidate the character number.
BUG: 399348
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/D23134