Fix memory config: user prompt text box (#12229)

### What problem does this PR solve?

As title

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

web/src/pages/memory/memory-setting/advanced-settings-form.tsx

@@ -146,7 +146,7 @@ export const AdvancedSettingsForm = () => {
             field={{
               name: 'user_prompt',
               label: t('memory.config.userPrompt'),
-              type: FormFieldType.Text,
+              type: FormFieldType.Textarea,
               horizontal: true,
               placeholder: t('memory.config.userPromptPlaceholder'),
               required: false,