Fixed ugly side effect of the win32 fullscreen changes
- don't try to resize the simulation window if minimized (iconic)
- handle window size correction in the gui event handler and by calling
  resize_main_window(FALSE), since fullscreen mode is not always required


git-svn-id: svn://svn.code.sf.net/p/bochs/code/trunk@12359 6c8e4198-a580-4521-a02f-c9ae86df1db9