Setting checkRight to false in refactoring jobs is not enough to disable right check anymore

XWIKI-15819 added an author check right which is true by default. In practice it means that any code which is based on an older version of the API and expect setCheckRight(false) to be enough to disable right check is broken.

Makes the Nested Pages Migrator Application unusable for example.

Instead of defaulting to true it should default to isCheckRight().