test: Reduce query count in tagging test

I believe this is because the M2M field ContentLibrary.authorized_lti_configs
has been removed. That field was being queried in order to compute the
`allow_lti` property when building a ContentLibraryMetadata object.

Author: kdmccormick

openedx/core/djangoapps/content_tagging/tests/test_objecttag_export_helpers.py

@@ -442,7 +442,7 @@ def test_build_library_object_tree(self) -> None:
         """
         Test if we can export a library
         """
-        with self.assertNumQueries(11):
+        with self.assertNumQueries(10):
             tagged_library = build_object_tree_with_objecttags(self.library.key, self.all_library_object_tags)
 
         assert tagged_library == self.expected_library_tagged_xblock