ecore-x: make error prints DBG not ERR so we don't get spammed

ecore-x: make error prints DBG not ERR so we don't get spammed

because an error with no idea where it came from since its async is
pretty much usless noise. if you want this to be useful you literally
need to do an xsync every x call and be able to get backtraces... the
xsync then would be inside ecore-x. and of course this would be so
nastily slow that you need to make it an option at build...