Fix cloneFragment conditional handling of clipboardData.setData (#2298)
Fix cloneFragment conditional handling of clipboardData.setData (#2298)

Seems the issue was introduced here: https://github.com/ianstormtaylor/slate/commit/dc95ad66a522e9d5c1626e65844f160834224696#diff-dfb9fbad6106fa548b8335a644d03e49L109

Remvoing the `return` ended  up calling `callback` twice instead of the intended once and both branches being followed
ianstormtaylor/slate,ianstormtaylor/slate,isubastiCadmus/slate