[AGIPD][CORRECT] Fix/Add missing imports for agipdlib

A small fix for missing imports

Description

How Has This Been Tested?

By testing initialize_from_db function

Relevant Documents (optional)

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the code style of this project.

Reviewers

@hammerd @roscar @danilevc