[Lens] Fix missing embeddable panel titles (elastic#203355)

## Summary

When using the new Custom Lens embeddable component, the titles are
hidden by default due to to a regression introduced in
elastic#186642.
This PR should fix the correct title handling of the header visibility
by hiding or showing the wrapping Panel title depending on the
`hidePanelTitles` props of the `LensRenderer` component


fix elastic#203354

x-pack/plugins/lens/public/react_embeddable/renderer/lens_custom_renderer_component.tsx

@@ -59,6 +59,7 @@ export function LensRenderer({
   filters,
   timeRange,
   disabledActions,
+  hidePanelTitles,
   ...props
 }: LensRendererProps) {
   // Use the settings interface to store panel settings
@@ -71,6 +72,7 @@ export function LensRenderer({
   }, []);
   const disabledActionIds$ = useObservableVariable(disabledActions);
   const viewMode$ = useObservableVariable(viewMode);
+  const hidePanelTitles$ = useObservableVariable(hidePanelTitles);
 
   // Lens API will be set once, but when set trigger a reflow to adopt the latest attributes
   const [lensApi, setLensApi] = useState<LensApi | undefined>(undefined);
@@ -112,7 +114,6 @@ export function LensRenderer({
   const panelProps: PanelProps = useMemo(() => {
     return {
       hideInspector: !showInspector,
-      hideHeader: showPanelChrome,
       showNotifications: false,
       showShadow: false,
       showBadges: false,
@@ -124,7 +125,7 @@ export function LensRenderer({
         return (extraActions ?? []).concat(actions || []);
       },
     };
-  }, [showInspector, showPanelChrome, withDefaultActions, extraActions, lensApi]);
+  }, [showInspector, withDefaultActions, extraActions, lensApi]);
 
   return (
     <ReactEmbeddableRenderer<LensSerializedState, LensRuntimeState, LensApi>
@@ -147,6 +148,7 @@ export function LensRenderer({
           ...initialStateRef.current,
           attributes: props.attributes,
         }),
+        hidePanelTitle: hidePanelTitles$,
       })}
       onApiAvailable={setLensApi}
       hidePanelChrome={!showPanelChrome}