chore(Modal): add size to close button

src/runtime/components/Modal.vue

@@ -99,6 +99,7 @@ const ui = computed(() => tv({ extend: modal, slots: props.ui })({
                   <UButton
                     v-if="close !== null"
                     :icon="appConfig.ui.icons.close"
+                    size="sm"
                     color="gray"
                     variant="ghost"
                     aria-label="Close"