fix: add initialization label on popover open

Author: SBIN2010

superset-frontend/src/explore/components/controls/DndColumnSelectControl/ColumnSelectPopoverTrigger.tsx

@@ -121,6 +121,8 @@ const ColumnSelectPopoverTriggerInner = ({
     if (!visible) {
       setPopoverLabel(initialPopoverLabel);
       setHasCustomLabel(false);
+    } else {
+      setPopoverLabel(initialPopoverLabel);
     }
   }, [initialPopoverLabel, visible]);