[pkger] "Group By" Histogram Setting Needs Updated Every Time

[rawkode]

      - axes:
          - name: x
        colors:
          - hex: '#31C0F6'
            name: Nineteen Eighty Four
            type: scale
          - hex: '#A500A5'
            name: Nineteen Eighty Four
            type: scale
          - hex: '#FF7E27'
            name: Nineteen Eighty Four
            type: scale
        height: 5
        kind: Histogram
        name: Releases by Repository
        position: stacked
        queries:
          - query: |-
                from(bucket: "gitseries")
                	|> range(start: v.timeRangeStart, stop: v.timeRangeStop)
                	|> filter(fn: (r) => r["_measurement"] == "tag")
                    |> group(columns: ["host", "owner", "repository"])
                	|> keep(columns: ["_time","repository", "_value"])
        width: 12
        xCol: _time
        yPos: 32

The histogram configuration, in the UI, allows for setting the group key. This isn't persisted by pkger export