Visualization custom label is not updated properly

[anbary (Andrew)]

When creating new table visualization I need to set a custom label name for the value, yet, when added, instead of removing the default name, the new value is added to the default one.
I did not have such issues in the previous versions of Kibana.

Current Kibana version: 6.1.2

[Marius_Dragomir]

This issue was probably missed in the Metric visualization revert that happened in 6.1.0. https://github.com/elastic/kibana/pull/14052

Could you add an issue in the Kibana repo about the issue? https://github.com/elastic/kibana/issues/new

Thanks!