By Andrew MacAskill and Elizabeth Piper LONDON (Reuters) -British Prime Minister Rishi Sunak defeated a Conservative rebellion on Wednesday over his plan to send asylum seekers to Rwanda, winning a costly victory that weakens his authority and deepens divisions in his party. Sunak faced down the rebellion by right-wingers in his Conservative Party by offering token compromises to those who demanded he toughen a new bill to tackle illegal immigration in moves centrists feared could breach human rights protections. In the end only 11 of Tuesday’s almost 60 rebels decided to vote against the legi…