UX: add close buttons to OH picker (fix #2482), fix crash

src/UI/InputElement/Helpers/OpeningHoursInput.svelte

@@ -10,6 +10,9 @@
   import Tr from "../../Base/Tr.svelte"
   import Translations from "../../i18n/Translations"
   import Check from "@babeard/svelte-heroicons/mini/Check"
+  import { CloseButton } from "flowbite-svelte"
+  import Cross from "../../../assets/svg/Cross.svelte"
+  import XMark from "@babeard/svelte-heroicons/mini/XMark"
 
   export let value: UIEventSource<string>
   export let args: string
@@ -31,16 +34,27 @@
 
   const state = new OpeningHoursState(value, prefix, postfix)
   let expanded = new UIEventSource(false)
+
+  function abort(){
+    expanded.set(false)
+  }
 </script>
 
 <Popup bodyPadding="p-0" shown={expanded}>
   <OHTable value={state.normalOhs} />
   <div class="absolute flex w-full justify-center" style="bottom: -3rem">
+    <button on:click={() => abort()}>
+      <XMark class="m-0 h-6 w-6"/>
+      <Tr t={Translations.t.general.cancel} />
+    </button>
     <button class=" primary" on:click={() => expanded.set(false)}>
       <Check class="m-0 h-6 w-6 shrink-0 p-0" color="white" />
       <Tr t={Translations.t.general.confirm} />
     </button>
+
   </div>
+    <CloseButton class="absolute top-0 right-0 z-10" style="margin-top: -1.0rem" on:click={() => abort()} />
+
 </Popup>
 
 <button on:click={() => expanded.set(true)}>Pick opening hours</button>