By Tom Hals and Anirban Sen WILMINGTON, Del. (Reuters) -Elon Musk and Twitter Inc may reach an agreement to end their litigation as soon as Wednesday and clear the way for the world’s richest person to close his $44 billion deal for the social media platform, a source familiar with the litigation told Reuters. Musk, who is also chief executive officer of electric car maker Tesla Inc, proposed to Twitter late on Monday he would change course and abide by his April agreement to buy the company for $54.20 per share if Twitter dropped its litigation against him. Twitter’s legal team, however, has …