mesh: Fix Health Period Set OpCode
mesh: Fix Health Period Set OpCode

This was a copy-paste mistake.

X-Original-Commit: 9a75c131940dd41ff8859cdd56cca83e132d71d6

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble