splitmuxsink: Fix off-by-one in running time comparison for split-at-running-time
splitmuxsink: Fix off-by-one in running time comparison for split-at-running-time

If we get a keyframe exactly at the requested running time we would only
split on the next keyframe afterwards due to wrong usage of > vs. >=.

GStreamer/gst-plugins-good,pexip/gst-plugins-good,pexip/gst-plugins-good,pexip/gst-plugins-good,GStreamer/gst-plugins-good,pexip/gst-plugins-good,pexip/gst-plugins-good,GStreamer/gst-plugins-good,GStreamer/gst-plugins-good