Default post tags not working on TW

[saurabhsirdixit]

Reported by TWP client: https://axelerant.atlassian.net/browse/SUPP-250
The default WordPress post tags are not working with Testimonials Widget.

Test Cases:
1: Verified the Testimonials Widget posts are associated with the post tags but showing "No Results Found" on the tag page.
2: If disable default tags/categories and create new TW tags and category it works.( "If checked, use Testimonials' own category and tag taxonomies than WordPress' defaults." )