Milestone count is missing group milestones
Summary
Moving a Milestone into a group will remove it from the count in the Milestones overview.
Steps to reproduce
![moving_milestone](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)
What is the current bug behavior?
The count doesn't represent the correct number
What is the expected correct behavior?
See the correct number in the counts.