fix(echarts): pass vizType to enable theme overrides in all chart types (#36389)

superset-frontend/plugins/plugin-chart-echarts/src/Gantt/EchartsGantt.tsx

@@ -83,6 +83,7 @@ export default function EchartsGantt(props: EchartsGanttChartTransformedProps) {
         echartOptions={echartOptions}
         selectedValues={selectedValues}
         eventHandlers={eventHandlers}
+        vizType={formData.vizType}
       />
     </>
   );