Fix channel retrieval for Reolink DUO V1 connected to a NVR

[starkillerOG]

Breaking change

Proposed change

Fix channel retrieval for Reolink DUO V1 connected to a NVR.
The DUO V1 (not sold anymore) takes up 2 channels of a NVR, meaning 2 channels will have the same UID. The upstream library takes care of this by appending the channel to the UID giving the format for the total device ID:
{NVR UID}_{DUO V1 UID}_{channel integer}.

In the retrieval function of the channel the last _{channel integer} was skipped, this meant always the first of the two channels of the DUO camera would be returned, giving issues.

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 Reolink Duo PoE entities problem #134912
• This PR is related to issue:
• Link to documentation pull request:

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