Minor linter fixes.

The code was stripped off from the scoping method to allow eclipse
closure tools integration to work. However the tools require more than
2GB of ram to process a full blown project so it is not recomended
solution. Instead simpler text editor with some integration tools (like
sb2 or vim) seem to be the better approach.
Update requires and augment symbols.

Adds the channelid symbol to the epg listing item.