Guillaume Desmottes ebfbdf9076 examples: webrtc: fix plugins check
`videoconvert` and `videoscale` are now part of the `videoconvertscale`
plugin, see d11f13f476411b828387c3c26619bc77c255affb

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3529>
2022-12-05 17:04:57 +00:00
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