Fix: Analytics Initialization Behavior (#3031)

# Description of Changes

Please provide a summary of the changes, including:

What was changed:

- Modified the default value of enableAnalytics in settings.yml.template
from `true` to `undefined`.

Why the change was made:

- The analytics setting was updated to prevent the value from defaulting
to true during initialization, which suppressed the display of the
prompt dialog. Changing it to `undefined` ensures that the user is
explicitly prompted to enable or disable analytics, thereby improving
user control.

Closes #(issue_number)

---

## Checklist

### General

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

src/main/java/stirling/software/SPDF/service/PostHogService.java

@@ -207,8 +207,7 @@ public class PostHogService {
 
     private void addIfNotEmpty(Map<String, Object> map, String key, Object value) {
         if (value != null) {
-            if (value instanceof String) {
+            if (value instanceof String strValue) {
-                String strValue = (String) value;
                 if (!StringUtils.isBlank(strValue)) {
                     map.put(key, strValue.trim());
                 }

src/main/resources/settings.yml.template

@@ -85,7 +85,7 @@ system:
   showUpdateOnlyAdmin: false # only admins can see when a new update is available, depending on showUpdate it must be set to 'true'
   customHTMLFiles: false # enable to have files placed in /customFiles/templates override the existing template HTML files
   tessdataDir: /usr/share/tessdata # path to the directory containing the Tessdata files. This setting is relevant for Windows systems. For Windows users, this path should be adjusted to point to the appropriate directory where the Tessdata files are stored.
-  enableAnalytics: 'true' # set to 'true' to enable analytics, set to 'false' to disable analytics; for enterprise users, this is set to true
+  enableAnalytics: 'undefined' # set to 'true' to enable analytics, set to 'false' to disable analytics; for enterprise users, this is set to true
   disableSanitize: false # set to true to disable Sanitize HTML; (can lead to injections in HTML)
   datasource:
     enableCustomDatabase: false # Enterprise users ONLY, set this property to 'true' if you would like to use your own custom database configuration