refactor(chart): replace word cloud sort_by_series migration with code defaults (#39575)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

superset-frontend/plugins/plugin-chart-word-cloud/src/plugin/buildQuery.ts

@@ -30,7 +30,7 @@ export default function buildQuery(formData: WordCloudFormData) {
   if (sort_by_metric && metric) {
     orderby.push([metric, false]);
   }
-  if (sort_by_series && series) {
+  if (sort_by_series !== false && series) {
     orderby.push([series, true]);
   }