Fix issue where styles weren't reset when re-using SVGs in colorbar

Fixes #5161

Author: anaplian

src/components/colorbar/draw.js

@@ -397,6 +397,7 @@ function drawColorBar(g, opts, gd) {
 
         var fills = g.select('.' + cn.cbfills)
             .selectAll('rect.' + cn.cbfill)
+            .attr('style', '')
             .data(fillLevels);
         fills.enter().append('rect')
             .classed(cn.cbfill, true)