Add additional Lao character to IDN confusables

  U+0E01 (ก) => n

Prior Lao/Thai entries were added in crrev.com/c/1058710.

Test: components_unittests --gtest_filter=*IDN*
Bug: 882078
Change-Id: I1e90b144a1d791341b515d026a6bc4be7cbed57d
Reviewed-on: https://chromium-review.googlesource.com/1220773
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Christopher Thompson <cthomp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591227}