image_view：set CvtColorForDisplay encoding as bgr8 (backport #1071)

[mergify]

based on issue 1021, Fix the issue that the input image encoding as yuv, error to show

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This is an automatic backport of pull request #1071 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of cebd97a has failed:

On branch mergify/bp/humble/pr-1071
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	both modified:   image_view/src/image_view_node.cpp

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