sdl - use the wParam and rawinput data for mouse state rather than just the message type, fixes missing mouse up events when alt-tabing out of the window

CR: SamL

src/video/windows/SDL_windowswindow.h

@@ -32,7 +32,7 @@ typedef struct
     HBITMAP hbm;
     WNDPROC wndproc;
     SDL_bool created;
-    int mouse_pressed;
+    Uint32 mouse_button_flags;
     struct SDL_VideoData *videodata;
 } SDL_WindowData;