[AlwaysOnTop] Round corners on Windows 11 (#19109)

* check window corners

* draw rounded rectangle

* draw rounded corners

* switch between rounded and not rounded rects

* added enabled corners setting

* update corner

src/modules/alwaysontop/AlwaysOnTop/SettingsConstants.h

@@ -9,5 +9,6 @@ enum class SettingId
     FrameColor,
     BlockInGameMode,
     ExcludeApps,
-    FrameAccentColor
+    FrameAccentColor,
+    RoundCornersEnabled
 };