Problem description: In Monitoring => Discovery view it is not possible to select the value of the "Discovery rule" field using the multiselect, the cavue can be selected only using autocomplete.

Steps to reproduce:

1. Navigate to Monitoring => Discovery view
2. Press "Select" button next to the "Discovery rule" field
3. Click on any value from the list provided in the opened overlay dialogue

Result: the overlay dialogue is closed, but the chosen value is not present in the "Discovery rule" field

Expected: the chosen value should be present in the "Discovery rule" field.

Example: