recipes: openwebrtc: set owr_version_id at class level
recipes: openwebrtc: set owr_version_id at class level

Set the default value of owr_version_id at the class level instead of
configure(). Fixes an AttributeError when the recipe is built and the configure
step is skipped (because already done).

multipath-rtp/cerbero,multipath-rtp/cerbero,EricssonResearch/cerbero,multipath-rtp/cerbero,multipath-rtp/cerbero,EricssonResearch/cerbero,shoreflyer/cerbero,EricssonResearch/cerbero,multipath-rtp/cerbero,shoreflyer/cerbero,EricssonResearch/cerbero,EricssonResearch/cerbero,shoreflyer/cerbero,shoreflyer/cerbero,shoreflyer/cerbero