Indicator popup window does not close when clicking on another screen

## Prerequisites
- [X] I have searched open and closed issues for duplicates.

## Describe the bug

With multiple screens, the popup window of indicators does not close when clicking another screen than the main one.

### To Reproduce
Steps to reproduce the behavior:
1. Click on any Wingpanel indicator to open the popup window
2. Click on any zone on another screen (without clicking on the main screen)

### Expected behavior

When clicking any zone on the main screen, the popup window of the indicator is closing. It should be the same behaviour when clicking on any other screen.

## Platform Information


Please check what applies:

- [ ] I'm using the latest version from git that I've manually compiled
- [X] I'm using the latest released stable version