[Lens] Last value operation loses user's format settings

[dej611]

Kibana version: master as fe1ae92 (> 7.12)

Describe the bug:

Chossing Last value from the Lens Quick Functions panel, the configured format setting gets reset to the Default value.

Steps to reproduce:

1. Open Lens and drop the bytes field (logs sample data) into the chart workspace
2. Configure the format for the Median of bytes dimension to Bytes (1024)
3. Click on Last value => format's get reset to Default

Expected behavior:

The format settings are kept as it happens with other operations.

Screenshots (if relevant):

Other operations/functions:

(Actually here I'm not sure it makes sense for Unique Count or Count to keep it.)

To Last value:

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)