fix: Configured PTZ actions should overrule auto-detected actions (not merge with them) (#1558)

* fix: Configured PTZ actions should overrule auto-detected actions (not merge with them)

* Don't populate capabilities unless there is some basis

tests/utils/ptz.test.ts

@@ -1,4 +1,4 @@
-import { describe, expect, it, vi } from 'vitest';
+import { describe, expect, it } from 'vitest';
 import { Capabilities } from '../../src/camera-manager/capabilities';
 import {
   getPTZTarget,