[component/onvif] remove default value of continuous_duration to support devices which do not implement "stop"

[yoxcu]

Proposed change

Using onvif.ptz to control cameras which do not fully support the onvif spec.
I have 2 cameras which can only be controlled using ContinuousMove and do not implement Stop.
To stop them it is nececcary to send another ContinuousMove with a distance of 0.

With a the change in this pr the default value of continuous_duration is removed and Stop is only called when continuous_duration is set.

ptz works nicely on a boifun/cloudedge/iegeek babycam using something like:

type: custom:advanced-camera-card
cameras:
  - camera_entity: camera.babycam_profile_000
    live_provider: auto
    ptz:
      actions_left_start:
        action: perform-action
        perform_action: onvif.ptz
        data:
          entity_id: camera.babycam_profile_000
          pan: LEFT
          distance: 1
          move_mode: ContinuousMove
      actions_left_stop:
        action: perform-action
        perform_action: onvif.ptz
        data:
          entity_id: camera.babycam_profile_000
          pan: LEFT
          distance: 0
          move_mode: ContinuousMove

also just noticed right now:
#145811 fixes the issue as well (but different)

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes ONVIF error when panning camera: "Failed to perform the action onvif/ptz. Action Not Implemented" #125680
• This PR is related to issue:
• Link to documentation pull request:
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[home-assistant]

Hey there @hunterjm, @jterrace, mind taking a look at this pull request as it has been labeled with an integration (onvif) you are listed as a code owner for? Thanks!

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