#849 Invalid 'Mismatched HTML tags' yellow warning

[Ahasuerus]

When a user creates a submission with "table" and/or "td" tags with attributes in the Note (and/or Synopsis) field, the submission review software displays an invalid 'Mismatched HTML tags' yellow warning. This is due to the fact that class isfdbUI in common/library.py includes "table" and "td" in the self.required_paired_tags list. The list is checked in mismatchedHtmlTagsPresent , which is called from invalidHtmlInNotes. "table" and "td" should be moved from self.required_paired_tags list to self.optional_paired_tags. They are already included in self.tags_with_attributes.