mesh: Fix encoding fault count to Health Current Status
mesh: Fix encoding fault count to Health Current Status

There was a missing adjustment to buf->len after fetching the faults
from the app.

X-Original-Commit: cad5746c49b0e774d7cd3886563aea63b871a8b3

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