appswitch: Decrement version to get PPC support.

The appswitch formula installs a binary that is Intel-only (and possibly >=10.6 only).  By going back a version, we can acquire PPC support for both Tiger and Leopard.

As far as I can see, there is no loss of functionality in doing so; Other than the dropping of PPC support (and Leopard support period at the same time), the only thing that's changed since v1.1 is a reworded man page.