Update chart brush on selected scrub range

[lovincyrus]

Follow up of https://github.com/rilldata/rill/pull/5483

Repro: scrub and refresh the page, you will no longer see the painted brush interval Expected: as long as there's a selected scrub range, we should update the brush_x or brush_yearweek_ts with the scrub range

updateChartBrushOnScrubRange