[HDRP][Compositor] Fixed issue with compositor custom pass hooks added/removed repeatedly #3613
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Purpose of this PR
https://fogbugz.unity3d.com/f/cases/1315971/
The compositor post-process hooks were added/removed repeatedly when the preview was disabled.
Testing status
Tested by adding a Debug.Log message as described in the bug ticket.

Now we get only one register or unregister event when toggling the preview:
Compositor test is green