[samples] Fixed uninitialized values in CEncodingPipeline constructor
[samples] Fixed uninitialized values in CEncodingPipeline constructor

Signed-off-by: Stanislav, Filippenko <ffd2c339624b364da52bf0c88c412fd24d900fb8@intel.com>

Intel-Media-SDK/MediaSDK,Intel-Media-SDK/MediaSDK,Intel-Media-SDK/MediaSDK,Intel-Media-SDK/MediaSDK,Intel-Media-SDK/MediaSDK