instance-ssh-details missing user override feature from instance-ssh

[Donovan Finch]

instance-ssh added [login] in #259 and both help text were updated in instance-ssh and instance-ssh-details, but the feature wasn't added to instance-ssh-details

Lines 236-239 need to be duplicated into instance-ssh-details above L277 to match, so that instance-ssh-details also recognizes a first argument that don't look like 'i-*'.

bash-my-aws/lib/instance-functions

Line 236 in 4a762d4

 if [[ $1 != *i-* ]]; then