fixup trace deletion for carpet traces
fixup trace deletion for carpet traces

- which is a weird case. It relies on trace.uid (like heatmaps/contour),
  but has <g.trace> group (like scatter/bar/...) which previously
  got deleted in that big selectAll('g.trace').remove() in
  Cartesian.plot. Now make _module.plot take care of trace deletion!

plotly/plotly.js,asolagmbh/plotly.js,aburato/plotly.js,etpinard/plotly.js,etpinard/plotly.js,plotly/plotly.js,plotly/plotly.js,aburato/plotly.js,asolagmbh/plotly.js,etpinard/plotly.js,plotly/plotly.js,asolagmbh/plotly.js