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plugins/screencast: Avoid resetting m_dmabufParams when resizing the stream

Vlad Zahorodnii requested to merge work/zzag/plugins-screencast-negotiation-fixes into master

ScreenCastStream::onStreamAddBuffer() can be called before the stream params are updated. This is problematic because that function expects a valid m_dmabufParams.

The reason why m_dmabufParams is reset is to force the onStreamParamChanged() function to check whether dmabufs can be still allocated with the new size.

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