add themechange notify on win

Zhao Yuhang

2023-12-22 61cb997e4e9ebf50bcff835841fbd1ecc9499e49

 src/core/style/styleagent_p.h

@@ -26,7 +26,7 @@

        StyleAgent *q_ptr;

        StyleAgent::SystemTheme systemTheme = StyleAgent::Dark;
        StyleAgent::SystemTheme systemTheme = StyleAgent::Unknown;

        virtual void setupSystemThemeHook();
        virtual void removeSystemThemeHook();