TOLTECS: Fix menu positining in the simplest way I can think of

All this does is to offset the image when copying it to the screen,
and offset the position when checking for clickable items at specific
coordinates. It looks and works right to me. I guess that just leaves
the buildColorTransTable2() function, but I'm useless for that so
someone else will have to look into it.

engines/toltecs/menu.cpp

@@ -58,10 +58,6 @@ int MenuSystem::run(MenuID menuId) {
 	_editingDescription = false;
 
 	_running = true;
-
-	// TODO: It seems the Y coordinate of the entire GUI should be offset
-	// by this much to be drawn correctly. At least, that appears to be the
-	// case for the main menu at the start of the game.
 	_top = 30 - _vm->_guiHeight / 2;
 
 	_needRedraw = false;
@@ -106,7 +102,7 @@ void MenuSystem::update() {
 
 	if (_needRedraw) {
 		//_vm->_system->copyRectToScreen(_vm->_screen->_frontScreen + 39 * 640 + 60, 640, 60, 39, 520, 247);
-		_vm->_system->copyRectToScreen(_vm->_screen->_frontScreen, 640, 0, 0, 640, 400);
+		_vm->_system->copyRectToScreen(_vm->_screen->_frontScreen, 640, 0, _top, 640, 400 - _top);
 		//debug("redraw");
 		_needRedraw = false;
 	}
@@ -206,7 +202,7 @@ void MenuSystem::handleKeyDown(const Common::KeyState& kbd) {
 
 ItemID MenuSystem::findItemAt(int x, int y) {
 	for (Common::Array<Item>::iterator iter = _items.begin(); iter != _items.end(); iter++) {
-		if ((*iter).rect.contains(x, y))
+		if ((*iter).rect.contains(x, y - _top))
 			return (*iter).id;
 	}
 	return kItemIdNone;