fix(multi-select): ListBoxField should not prevent default behavior

Fixes #938

src/ListBox/ListBoxField.svelte

@@ -60,7 +60,7 @@
   on:mouseover
   on:mouseenter
   on:mouseleave
-  on:keydown|preventDefault|stopPropagation
+  on:keydown
   on:focus
   on:blur
 >

src/MultiSelect/MultiSelect.svelte

@@ -315,10 +315,17 @@
           open = !open;
         }
       }}"
-      on:keydown="{({ key }) => {
+      on:keydown="{(e) => {
         if (filterable) {
           return;
         }
+
+        const key = e.key;
+
+        if ([' ', 'ArrowUp', 'ArrowDown'].includes(key)) {
+          e.preventDefault();
+        }
+
         if (key === ' ') {
           open = !open;
         } else if (key === 'Tab') {