Use the standard variable STUDY_UID for populating the field "Created By" in the Basic details segment of the Nursery Manager

Reviewer: Tiffany Go (post-commit)

Issue: GCP-9113
Merge branch 'master_dev' of https://github.com/digitalabs/Fieldbook into master_dev

Conflicts:
	src/main/webapp/WEB-INF/static/css/fieldbook.css