fix: When collecting data from the multiple-choice box of the form collection node, it is recommended to support pressing enter to select the option (#4237)

Author: shaohuzhang1

ui/src/components/dynamics-form/items/select/MultiSelect.vue

@@ -5,6 +5,7 @@
     filterable
     allow-create
     clearable
+    default-first-option
     :reserve-keyword="false"
     v-bind="$attrs"
     v-model="_modelValue"