bug#3395: 23.0.94; Remove colon after option etc. name

Please remove the colon after the option (or face etc.) name, at least
when `custom-unlispify-*' is nil.
 
A colon is a symbol consituent. A command that picks up the symbol at
point will conveniently pick up the variable etc. name, but it will
also include the colon (assuming that it correctly respects Lisp
symbol syntax), which is incorrect.
 
The colon serves no purpose here, anyway.
 

In GNU Emacs 23.0.94.1 (i386-mingw-nt5.1.2600)
 of 2009-05-24 on SOFT-MJASON
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4)'