fix: current project officer not being selected in edit form

[stevtek]

What changed

fix for the the project officer combo box being empty when edit an agreement with a project

NOTE: this removes code which says that it's a workaround for a caching problem, but I can't replicate that now

Issue

#1537

How to test

• edit an agreement which already has a project officer, the project officer combobox should be populated with that

Screenshots

If relevant, e.g. for a front-end feature

Definition of Done Checklist

• [ ] OESA: Code refactored for clarity
• OESA: Dependency rules followed
• Automated unit tests updated and passed
• Automated integration tests updated and passed
• Automated quality tests updated and passed
• Automated load tests updated and passed
• Automated a11y tests updated and passed
• Automated security tests updated and passed
• 90%+ Code coverage achieved
• [ ] Form validations updated

Links

If relevant, e.g. for a link to a piece of markdown documentation