[cli] fix invalid `commissioner mgmtget` cli arguments in tests (#7325)
[cli] fix invalid `commissioner mgmtget` cli arguments in tests (#7325)

This commit fixex the wrong commissioner mgmt cli args which uses
"binary" to indicate following binary args in HEX string - the format
has been changed to "-x" in #5549.

The reason why cli-commissioner.exp doesn't fail consistently is not
fixed by this commit.
srickardti/openthread,jwhui/openthread,srickardti/openthread,openthread/openthread,jwhui/openthread,openthread/openthread,srickardti/openthread,abtink/openthread,openthread/openthread,openthread/openthread,abtink/openthread,abtink/openthread,srickardti/openthread,jwhui/openthread,jwhui/openthread,abtink/openthread