openh264enc: Use a fixed number of slices by default
openh264enc: Use a fixed number of slices by default

deepikateriar/openwebrtc-plugins-0.8,deepikateriar/openwebrtc-plugins-0.8,ford-prefect/openwebrtc-gst-plugins,deepikateriar/openwebrtc-plugins-0.8,sancane/openwebrtc-gst-plugins,ford-prefect/openwebrtc-gst-plugins,ossy-szeged/openwebrtc-gst-plugins,EricssonResearch/openwebrtc-gst-plugins,sancane/openwebrtc-gst-plugins,deepikateriar/openwebrtc-plugins-0.80,ford-prefect/openwebrtc-gst-plugins,ossy-szeged/openwebrtc-gst-plugins,deepikateriar/openwebrtc-plugins-0.80,deepikateriar/openwebrtc-plugins-0.8,EricssonResearch/openwebrtc-gst-plugins,ford-prefect/openwebrtc-gst-plugins,ossy-szeged/openwebrtc-gst-plugins,ossy-szeged/openwebrtc-gst-plugins,EricssonResearch/openwebrtc-gst-plugins,deepikateriar/openwebrtc-plugins-0.80,sancane/openwebrtc-gst-plugins,deepikateriar/openwebrtc-plugins-0.80