By Shilpa Jamkhandikar and Rafael Nam MUMBAI (Reuters) – Prime Minister Narendra Modi spearheaded his party’s campaign for elections later this week in Maharashtra state, knowing that victory in the home of financial hub Mumbai will make it easier to push through economic reforms. The state of Haryana also votes on Wednesday. But it is Maharashtra that will provide the best test of how well Modi’s appeal is holding up, five months after he stormed to power in a general election with promises to mend a country battered by corruption scandals, high inflation, and sharply slowing growth. …