Fix width of chart nav dates
Fix width of chart nav dates

So panning arrows don't move on daily chart.

Make sure it fits with longest text string, "Wednesday, September 31st".

tidepool-org/blip,hichameyessou/blip,hichameyessou/blip,tidepool-org/blip,tidepool-org/blip,hichameyessou/blip