Create unit tests for magnification API (#17413)
Link to issue number:
None
Summary of the issue:
There are no unit tests for the magnification API
Description of user facing changes
None
Description of development approach
Certain magnification functions that were not included in Windows versions older than Windows 8 had special handling.
This handling can be removed now that the minimum support version is Windows 8.
Creates basic tests for unit testing the Magnification API, starting with screen curtain functions
Testing strategy:
run unit tests
