Views: Filter by tag, group title (possibly others) broken

This issue popped up for us when trying to filter by tag. The SQL query views is generating attempts to filter on civicrm_tag.name using the tag id.

The attached patch fixes this BUT it subsequently breaks sorting based on tag name/group name, as behind the scenes views will be sorting based on id. I'm not sure how to fix this — but I note sorting is broken in the exact same way for, eg. activity_type, website_type, phone_type.

The issue all view data that uses the civicrm_handler_filter_pseudo_constant handler for filters, but does not modify the 'real field' to the constant id. I've only spotted it being broken for these two types.