fix: groupable only columns populating in filters (#6993)

superset/assets/src/explore/controls.jsx

@@ -1966,7 +1966,7 @@ export const controls = {
     default: null,
     description: '',
     mapStateToProps: state => ({
-      columns: state.datasource ? state.datasource.columns : [],
+      columns: state.datasource ? state.datasource.columns.filter(c => c.filterable) : [],
       savedMetrics: state.datasource ? state.datasource.metrics : [],
       datasource: state.datasource,
     }),