[Bot] [Discussion] [PR #14050] fix: Enable get_query/set_query for link selectors to get filtered list

Testing Site URL: https://gh-imp-2021-00957.castlecraft.co.in

Pull Request URL: https://github.com/frappe/frappe/pull/14050
Pull Request Title: fix: Enable get_query/set_query for link selectors to get filtered list
Pull Request Description:

Before: The link selector was not considering the get_query set for a link field due to which item list in the link selector was not getting updated according to get_query.

https://user-images.githubusercontent.com/13928957/130906663-eed5c29b-cea7-4fc4-909d-f6f7c2ce3b63.mov

After: Filter in get_query is honored and the list is updated after each record insert.

https://user-images.githubusercontent.com/13928957/130906860-2cf9ed9f-ab9e-4b9a-822d-96a34c69b883.mov

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