Fix handling of frame color parameters in TTY sessions (Bug#19802)

Fix handling of frame color parameters in TTY sessions  (Bug#19802)

 src/xfaces.c (map_tty_color): Use assoc_no_quit instead of
 assq_no_quit to fetch color definition by its string name.

 lisp/frame.el (frame-notice-user-settings): Refresh the value of
 frame parameters after calling tty-handle-reverse-video.  Call
 face-set-after-frame-default with the actual parameters, to avoid
 resetting colors back to unspecified.
 (set-background-color, set-foreground-color): Pass the selected
 color to face-set-after-frame-default.