Edit Robots.php - replaced comma separator string with getSeparator method to...

Jeff Turnerrequested to merge
issue/metatag-3578021:3578021-custom-separator-default-checkboxes into 2.2.x

Edit Robots.php - replaced comma separator string with getSeparator method to repair metatag problems on the node/edit form. This change seems to fix the issue described regarding the custom separator and robots metatag. Closes #3578021

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