unicode/norm: fix disabled test

Test is now run as part of go generate.

The data_test.go file that is generated is very large
(350K) and is really only needed when one is
generating anyway.

Change-Id: I9ff407b802a51d2638716adf11bc73554628c077
Reviewed-on: https://go-review.googlesource.com/38193
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Nigel Tao <nigeltao@golang.org>
5 files changed