refactor: remove redundant = false defaults on boolean props (#9155)

## Summary

Remove redundant `= false` defaults from destructured `defineProps` on
boolean props, since Vue's [Boolean
casting](https://vuejs.org/guide/components/props.html#boolean-casting)
already defaults absent boolean props to `false`.

## Changes

- **What**: Remove 10 unnecessary `= false` default values across 8
components

## Review Focus

Vue compiles `defineProps<{ myBool?: boolean }>()` to `{ myBool: { type:
Boolean, required: false } }`. Boolean casting means absent boolean
props are already `false` — the explicit `= false` in JS destructuring
defaults never triggers.

Follow-up to #9150.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9155-refactor-remove-redundant-false-defaults-on-boolean-props-3116d73d36508196af0bcba53257720a)
by [Unito](https://www.unito.io)

src/renderer/extensions/vueNodes/widgets/components/form/FormSelectButton.vue

@@ -63,7 +63,7 @@ const {
   options,
   optionLabel = 'label',
   optionValue = 'value',
-  disabled = false
+  disabled
 } = defineProps<Props>()
 
 const emit = defineEmits<Emits>()

src/renderer/extensions/vueNodes/widgets/components/form/dropdown/FormDropdownInput.vue

@@ -20,7 +20,7 @@ interface Props {
 }
 
 const {
-  isOpen = false,
+  isOpen,
   placeholder = 'Select...',
   items,
   displayItems,