[download YUY2/UYVY] fix a regression
[download YUY2/UYVY] fix a regression

The call to glLoadIdentity was removed by mistake during
OpenGL ES 2.0 integration.

mapmapteam/gst-plugins-gl,ystreet/gst-plugins-gl,mapmapteam/gst-plugins-gl,mapmapteam/gst-plugins-gl,ystreet/gst-plugins-gl,ystreet/gst-plugins-gl