Always add initial message to *scratch* buffer if

Always add initial message to *scratch* buffer if
`initial-scratch-message' is non-nil regardless of the value of
`inhibit-startup-screen'.
(inhibit-startup-screen, initial-scratch-message): Doc fix.
(command-line-1): Move code that inserts `initial-scratch-message'
up before the if-form that checks for `inhibit-startup-screen'.
Suggested by Jonathan Rockway <jon@jrock.us>.