Fix an AppleEvent warning that's cluttering up the console

OK so no more pull requests... but this one's small.

Since I improved QS's AS action handling (getDirectTypes/getIndirectTypes) there's been an annoying log on every QS launch:

> .scriptSuite warning for result type of command 'GetDirectTypes' in suite 'QuicksilverHandlers': 'list' is not a valid type name.

Just a typo on my part. It's fixed here.
Aside: .scriptSuite files shouldn't be used any more. [Apparently](https://developer.apple.com/library/mac/documentation/cocoa/conceptual/ScriptableCocoaApplications/SApps_suites/SAppsSuites.html#//apple_ref/doc/uid/20001241-SW3) we should use sdef files instead.

> Important: Starting in OS X version 10.4, Cocoa applications can supply scripting information in the sdef format, described in “Preparing a Scripting Definition File.” This is the preferred format going forward.