Fix environments filter

[Igorolivei]

Describe the bug
When you open the groups list, the "Environment" filter is listing the environments of all master zones, even after selecting a Master Zone; it should list only the ones of the Master Zone that you selected on filter.

To Reproduce
Steps to reproduce the behavior:

1. Go to the Groups list
2. Select a Master Zone on the filter
3. Open the Environment filter
4. The list will contain all environments of all master zones

Expected behavior
When you select a Master Zone, the list of the Environment filter should contain only the environments present on that Master Zone.