revise windows to be even closer to hardware.

apparently hardware only ever updates its 'inside/outside window' status when reaching the coordinates. which becomes apparent if you, like, try to invert a window midframe.

src/GPU2D.h

@@ -90,8 +90,8 @@ private:
     u8 Win0Coords[4];
     u8 Win1Coords[4];
     u8 WinCnt[4];
-    bool Win0Active;
-    bool Win1Active;
+    u32 Win0Active;
+    u32 Win1Active;
 
     u8 BGMosaicSize[2];
     u8 OBJMosaicSize[2];