fix(workflow): show clear all button when any inspect tab has data

Previously the button visibility was tab-dependent, hiding it when
switching to an empty tab even if the other tab had data.

web/app/components/workflow/variable-inspect/panel.tsx

@@ -37,7 +37,7 @@ const VariablesPanel: FC<{ onClose: () => void }> = ({ onClose }) => {
     setCurrentFocusNodeId('')
   }, [deleteAllInspectorVars, setCurrentFocusNodeId])
 
-  const hasData = resolvedTab === InspectTab.Variables ? !isVariablesEmpty : hasArtifacts
+  const hasData = !isVariablesEmpty || hasArtifacts
   const headerActions = hasData
     ? (
         <Button variant="ghost" size="small" onClick={handleClear}>