Bug 42150: (follow-up) Remove duplicate h export

- The explicit `export { h }` from the "Re-export h" follow-up
  conflicts with `export * from "vue"` added in the "Share Vue
  via import map" follow-up, since the wildcard re-export already
  includes h
- Remove the redundant named export to fix the rspack build error:
  "Duplicate export of 'h'"

Signed-off-by: Arthur Suzuki <arthur.suzuki@biblibre.com>
Signed-off-by: Thomas Klausner <domm@plix.at>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>

koha-tmpl/intranet-tmpl/prog/js/vue/modules/islands.ts

@@ -1,5 +1,4 @@
-import { Component, defineCustomElement, h } from "vue";
-export { h };
+import { Component, defineCustomElement } from "vue";
 export * from "vue";
 import { createPinia } from "pinia";
 import { $__ } from "../i18n";