fix(weight): weighted button was not working after clearing the board that had an edge

Author: Stone-r1

src/board.cpp

@@ -30,6 +30,7 @@ void Board::clear() {
 
  graph.resize(MAX_NODES);
  nodes.assign(MAX_NODES, Node::makeInvalidNode());
+ edges = 0;
 }
 
 Node* Board::findNodeFromPosition(const Vector2& firstNodePosition) {