anevia_streams.lua: partially tighten URL probe function
anevia_streams.lua: partially tighten URL probe function

Ref. #17488

xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc