[RFC] change keymaps for FullscreenLiveTV section

I want to discuss if we should change the default key mappings for FullscreenLiveTV section in remote.xml.
Currently we use _left/right_ to change the channel group which i think is unnecessary as we could do this in channel osd instead. Now we could use _left/right_ for timeshift seeking. Furthermore we should change _select_ to open the channel osd because we all need quick access to the channel list.