secure/precis: simplify tables

Also fixes a bug where Jamo was included and Hangul excluded,
instead of vice versa.

Change-Id: Ia01ad5d24c66da1af1303cc397fd320d9d6e9615
Reviewed-on: https://go-review.googlesource.com/23596
Reviewed-by: Nigel Tao <nigeltao@golang.org>
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
8 files changed