TextEditor: Enable CMake syntax highlighting

Author: https://github.com/AtkinsSJ
Commit: ac824677b8
Pull-request: https://github.com/SerenityOS/serenity/pull/17668
Reviewed-by: https://github.com/ADKaster ✅

Userland/Applications/TextEditor/MainWidget.h

@@ -127,6 +127,7 @@ private:
 
     GUI::ActionGroup syntax_actions;
     RefPtr<GUI::Action> m_plain_text_highlight;
+    RefPtr<GUI::Action> m_cmake_highlight;
     RefPtr<GUI::Action> m_cpp_highlight;
     RefPtr<GUI::Action> m_css_highlight;
     RefPtr<GUI::Action> m_js_highlight;