fix: correct modal button callback for email template reset

- Updated the modal callback from `onNegativeClick` to `onPositiveClick` to ensure the correct action is triggered when confirming the reset of the email template.
- This change clarifies the user interaction flow and improves the functionality of the reset confirmation modal.

Signed-off-by: Innei <tukon479@gmail.com>

Author: Innei

src/views/extra-features/assets/template/tabs/email.tsx

@@ -45,12 +45,12 @@ export const EmailTab = defineComponent({
       modal.warning({
         title: '确认重置？',
         content: '重置后，模板将被恢复为默认模板',
-        async onNegativeClick() {
+        async onPositiveClick() {
           await optionsApi.deleteEmailTemplate({ type: templateType.value })
 
           await fetch()
         },
-        onPositiveClick() {},
+
         negativeText: '取消',
         positiveText: '确认',
       })