fix: save condition on operator change in PolicyCondition.vue

[arjavdongaonkar]

Description

Fix policy condition operator changes not being saved automatically. Added missing change event handler to the operator dropdown to trigger saveCondition() when the operator value is modified, ensuring consistency with subject and value field behavior.

Addressed Issue

Fixes #[508] - Policy condition operator changes not being saved

Solution: Added v-on:change="saveCondition" to the operator select component, matching the pattern used by other form fields in the component.

Technical Details:

• The fix is minimal and follows the existing component pattern
• No additional logic was needed since saveCondition() already handles operator changes correctly
• This ensures immediate persistence of operator changes without requiring additional user interaction

Before: Operator changes required modifying another field to trigger save
After: Operator changes are saved immediately upon selection

Checklist

• I have read and understand the [contributing guidelines](https://github.com/DependencyTrack/dependency-track/blob/master/CONTRIBUTING.md#pull-requests)
• This PR introduces new or alters existing behavior, and I have updated the [documentation](https://github.com/DependencyTrack/dependency-track/tree/master/docs/_docs) accordingly (No documentation changes needed - this is a bug fix that restores expected behavior)

[owasp-dt-bot]

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