(Corrects syntax in first paragraph) By Amruta Khandekar and Ankika Biswas (Reuters) -U.S. stock indexes were set to open higher on Tuesday after China further relaxed its COVID-19 curbs by scrapping quarantine rule for inbound travelers, while a slump in Tesla shares was set to pressure the Nasdaq. Beijing’s move comes after three years of zero-tolerance measures have battered the country’s economy and follows an abrupt policy U-turn this month of dropping nearly all domestic COVID-19 restrictions. “With China opening up and being less restrictive, the hope is that China will show an increase…