test: Update popover component image snapshots
Popover styles were updated in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/28375. We need to update the image snapshots on gitlab-ui
Edited by Enrique Alcántara
Popover styles were updated in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/28375. We need to update the image snapshots on gitlab-ui