mesh: shell: Fix IVIndex parsing
mesh: shell: Fix IVIndex parsing

Fix the parsing of IVIndex value from shell command line for
cmd_provision

X-Original-Commit: a77bd09113ff59cb429bf68e8a1e165621635cdd

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