Remove some leftover compat code from ps-print

Remove some leftover compat code from ps-print

* lisp/ps-def.el (ps-mark-active-p): Make obsolete in favor of
'mark-active'.  Update callers.
(ps-face-foreground-name): Make obsolete in favor of
'face-foreground'.  Update callers.
(ps-face-background-name): Make obsolete in favor of
'face-background'.  Update callers.
(ps-color-device): Make into obsolete function alias for
'display-color-p'.  Update callers.