remove by accident merged files

addons/katebuild-plugin/highlighter.h

-//
-// Description: Widget for configuring build targets
-//
-// SPDX-FileCopyrightText: 2011-2014 Kåre Särs <kare.sars@iki.fi>
-//
-//  SPDX-License-Identifier: LGPL-2.0-only
-
-#ifndef HIGHLIGHTER_H
-#define HIGHLIGHTER_H
-
-#include <QSyntaxHighlighter>
-
-class Highlighter : public QSyntaxHighlighter
-{
-public:
-    using QSyntaxHighlighter::QSyntaxHighlighter;
-
-private:
-};
-
-#endif