修复：回款管理-编辑：不显示合同名称

(cherry picked from commit 776846febcf9d6f36294df5058a42579efd107aa)

src/views/crm/receivable/ReceivableForm.vue

@@ -186,6 +186,8 @@ const open = async (
     formLoading.value = true
     try {
       formData.value = await ReceivableApi.getReceivable(id)
+      await handleCustomerChange(formData.value.customerId)
+      formData.value.contractId = formData.value.contract.id
     } finally {
       formLoading.value = false
     }