Fix issue where call to unique() failed because the input cell array had strings and char arrays

Author: robertoffmoura

plotly/plotlyfig_aux/core/updateLegendMultipleAxes.m

@@ -33,7 +33,7 @@
         allDomain(traceIndex, 2) = max(yAxis.domain);
     end
 
-    [~, groupIndex] = unique(allNames);
+    [~, groupIndex] = unique(string(allNames));
 
     for traceIndex = groupIndex'
     obj.data{traceIndex}.showlegend = allShowLegens(traceIndex);