FIX: Change field groupby button to new groupby

[dougburks]

As an analyst, when I'm in SOC Dashboards or Hunt and I drill into a particular event and find a field of interest, there is a button on the far left that allows me to do a groupby for that particular field. This feature goes back to the original version of Hunt which just had a single groupby table and so it adds the field as a groupby to that table. In some cases, this won't work properly. Now that Hunt and Dashboards supports multiple groupby tables, we should change this button to add the field as a new groupby table.

[dougburks]

Updated docs:
Security-Onion-Solutions/securityonion-docs@a3fc2dd

[dougburks]

Tested and verified: