Mustache/Handlebars: minor fixes

Summary:
Using WordDetect rules for Tags causes them not to be highlighted after text. This only affects the folding of some tags. I also used non-capture groups in RegExpr rules.

Changes:

• Fix the name of the tag section (before it was written "sectiond").
• Use kateversion="5.44", since insensitive WordDetect is used.
• Use non-capturing groups in RegExpr rules.

Reviewers: Framework: Syntax Highlighting, dhaumann, cullmann

Reviewed By: Framework: Syntax Highlighting, dhaumann

Subscribers: kwrite-devel, kde-frameworks-devel

Tags: Kate, Frameworks

Differential Revision: https://phabricator.kde.org/D24354