Fix a`ll engines. They work, though current fix is just temporary.

There are plans to add some brains to GameDetector class, which will let us
avoid passing detector to init() method.

svn-id: r15873

backends/sdl/graphics.cpp

@@ -1062,8 +1062,6 @@ void OSystem_SDL::toggleMouseGrab() {
 }
 
 void OSystem_SDL::draw_mouse() {
-	assert (_transactionMode == kTransactionNone);
-
 	if (_mouseDrawn || !_mouseVisible)
 		return;