Add judgement "IsHandleCreated" in OwnerDraw

Author: LeafShi1

src/System.Windows.Forms/System/Windows/Forms/Controls/Buttons/Button.cs

@@ -161,12 +161,13 @@ private protected override bool OwnerDraw
         get
         {
             if (Application.IsDarkModeEnabled
-
                 // The SystemRenderer cannot render images. So, we flip to our
                 // own DarkMode renderer, if we need to render images, except if...
                 && Image is null
                 // ...or a BackgroundImage, except if...
                 && BackgroundImage is null
+                // Delay BackgroundImage check until handle is created to avoid early null misjudgment
+                && IsHandleCreated
                 // ...the user wants to opt out of implicit DarkMode rendering.
                 && DarkModeRequestState is true