Revert "Adjust tag query in books#all_by_tag"
Revert "Adjust tag query in books#all_by_tag"

This reverts commit 7cc67f28d9d508df7aff7b35081a07b6f1dfcbde.

johan-andersson01/biblion,johan-andersson01/biblion,johan-andersson01/biblion,johan-andersson01/biblion