Technically this should not be required anymore (we no longer selectively respond to dialplan fetch requests).  However, I do not have a good reason not to add it and if you tested it with it present then lets leave it! :)

Just as an FYI:
The "proper" way if the context value was still relevant might have been to move this to something like wh_types.hrl as a define (perhaps ?DEFAULT_FS_PROFILE).  However, that is leaking a FreeSWITCH specific value, so an even better way would be to change ecallmgr (the FreeSWITCH abstraction layer) to parse loopback requests and add it if not present.  Since clicktocall was they only thing being a bit nasty in this respect we "let it slide".  TL;DR> When context_2 was important it would have been best to avoid continuing to scattering it throughout the code.