(file-name-shadow-properties-custom-type): Renamed from

(file-name-shadow-properties-custom-type):  Renamed from
`read-file-name-electric-shadow-properties-custom-type'.  Change name of face.
(file-name-shadow-properties): Renamed from
`read-file-name-electric-shadow-properties'.
(file-name-shadow-tty-properties): Renamed from
`read-file-name-electric-shadow-tty-properties'.
(file-name-shadow): Renamed from `read-file-name-electric-shadow'.
(rfn-eshadow-setup-minibuffer): Update references to renamed variables.
(file-name-shadow-mode): Renamed from `read-file-name-electric-shadow-mode'.
Update references to renamed variables.