wordgrinder: Fix sha256 hash

The hash used for fetchFromGitHub was on the archive itself, however
fetchFromGitHub is actually a wrapper of fetchzip:

hash mismatch in fixed-output derivation '...-source':
  wanted: sha256:1zqx3p9l22njni44ads3fyw3xh6807wmb5k1x2glg61z81cwc6sf
  got:    sha256:08lnq5wmspfqdjmqm15gizcq0xr7mg4h62qhvwj63v0sd6ks1cal

When using nix-prefetch-url without the --unpack argument, I get:

1zqx3p9l22njni44ads3fyw3xh6807wmb5k1x2glg61z81cwc6sf

And with the --unpack argument:

08lnq5wmspfqdjmqm15gizcq0xr7mg4h62qhvwj63v0sd6ks1cal

Just to be 100% sure the contents are the same, I also diffed the
contents of the former tarball with the outputs of the unpacked dir and
they're the same.

I didn't actually test the package (which doesn't build right now
anyway), but now at least the source checksum is fixed :-)

Signed-off-by: aszlig <aszlig@nix.build>
Cc: @matthiasbeyer