Updating disable_metrics settings from Configs is being overridden

[petruki]

Describe the bug
Enabling/disabling metrics are overwriting multi-environment settings.

To Reproduce from Switcher Management
Steps to reproduce the behavior:

1. Select a Switcher
2. Disable metrics for one environment
3. Select another environment
4. Disable metrics

Expected behavior
The disabled metrics state for all environments should be maintained.