Make customizing ItemListLayout header explicitly reducable (#2956)

- Add search placeholder text for helm releases

Signed-off-by: Sebastian Malton <sebastian@malton.name>

src/renderer/components/+catalog/catalog.tsx

@@ -205,7 +205,6 @@ export class Catalog extends React.Component<Props> {
     return (
       <ItemListLayout
         renderHeaderTitle={this.catalogEntityStore.activeCategory?.metadata.name ?? "Browse All"}
-        isSearchable={true}
         isSelectable={false}
         className="CatalogItemList"
         store={this.catalogEntityStore}
@@ -242,7 +241,6 @@ export class Catalog extends React.Component<Props> {
     return (
       <ItemListLayout
         renderHeaderTitle={this.catalogEntityStore.activeCategory?.metadata.name ?? "Browse All"}
-        isSearchable={true}
         isSelectable={false}
         className="CatalogItemList"
         store={this.catalogEntityStore}