work-for-faction.js: Should wait for Silhouette faction invite

[alainbryden]

#413 Fixed a variety of issues around Silhouette - but there's still a problem with it expecting some external script to magically join the faction for it:

It turns out that this is not the case if all Silhouette augs have been purchased. It should be up to work-for-factions.js to invoke waitForFactionInvite when all requirements are met.

The pain point is that right now, the requirement of "be CTO" isn't possible, the only requirements are reputation based, so we may need to just bite the bullet and add a special-case if-statement for this faction.

This isn't critical - without it work-for-faction,js will eventually break to check for new priorities, and won't return.