Updated error msg printf for "am -u am".

[vishnu350]

Just a simple fix I made a while back to improve the error message explained in issue #2083.

Thanks.

[ivan-hc]

Good, I'll merge in dev for review, but don't worry. It is a welcomed change.

[ivan-hc]

I have changed it like this

[ "$arg" = "$AMCLI" ] && arg_autoupdatable=", use \"-s\" instead"

• quotes on "$arg" to prevent expanding
• $AMCLI instead of am, to made it work also with AppMan
• "-s", without specify the CLI

[ivan-hc]

@vishnu350 welcome on board!